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Resonator location [message #343679]

Sun, 26 May 2019 05:52

ree_eric

Messages: 43
Registered: February 2004
Location: Alexandria, Ontario, Cana...

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Member

Looking for the most effective place to put the installed inside the pipe auger resonator in a 3" rear muffler system.

Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux vacuum, fuel tank sealing, rebuilt senders and new rubber, propane hot water heater.) Alexandria, Ontario, Canada

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Re: Resonator location [message #343682 is a reply to message #343679]

Sun, 26 May 2019 07:33

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

Karma: 10

Senior Member

ree_eric wrote on Sun, 26 May 2019 05:52

Looking for the most effective place to put the installed inside the pipe auger resonator in a 3" rear muffler system.

I put the resonator after the "Y" where it makes the turn out to the passenger side frame rail. Here is a couple of pics.

http://www.gmcmhphotos.com/photos/rear-mounted-flowmaster/p34139-img-2885.html
http://www.gmcmhphotos.com/photos/rear-mounted-flowmaster/p34140-img-2886.html

JWID

Larry

Smile

78 Royale w/500 Caddy
Menomonie, WI.

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Re: Resonator location [message #343687 is a reply to message #343682]

Sun, 26 May 2019 09:39

ree_eric

Messages: 43
Registered: February 2004
Location: Alexandria, Ontario, Cana...

Karma: 0

Member

Can't use that position as the 2 90s are wielded there but I could put it just before the straight pipe to the rear. Not were it shows in the picture.

http://www.gmcmhphotos.com/photos/member-galleries/p66425-exhaust-front.html

http://www.gmcmhphotos.com/photos/data/500/Exhaust_Front.jpg

Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux vacuum, fuel tank sealing, rebuilt senders and new rubber, propane hot water heater.) Alexandria, Ontario, Canada

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Re: [GMCnet] Resonator location [message #343689 is a reply to message #343687]

Sun, 26 May 2019 11:13

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

Leave it out. If you get a "Raaaaappppp" sound out the tailpipe, use a
"Racket Buster" tailpipe extension, or a convoluted section in the last 3
or 4 feet of the tailpipe. Both are effective, and cheap and non
restrictive.
Jim Hupy

On Sun, May 26, 2019, 9:07 AM Eric Bornstein via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Can't use that position as the 2 90s are wielded there but I could put it
> just before the straight pipe to the rear. Not were it shows in the
> picture.
>
>
> http://www.gmcmhphotos.com/photos/member-galleries/p66425-exhaust-front.html
>
> http://www.gmcmhphotos.com/photos/data/500/Exhaust_Front.jpg
> --
> Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over
> blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux
> vacuum,
> fuel tank sealing, rebuilt senders and new rubber, propane hot water
> heater.) Alexandria, Ontario, Canada
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Re: [GMCnet] Resonator location [message #343715 is a reply to message #343689]

Mon, 27 May 2019 09:23

ree_eric

Messages: 43
Registered: February 2004
Location: Alexandria, Ontario, Cana...

Karma: 0

Member

Don't like the restriction so I may leave it out and if I have a drone I may try a resonator tube. I will try the exhaust tip first.

https://www.performancetrucks.net/forums/gm-engine-exhaust-performance-21/how-build-exhaust-resonator-tube-eliminate-drone-489463/page2/

Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux vacuum, fuel tank sealing, rebuilt senders and new rubber, propane hot water heater.) Alexandria, Ontario, Canada

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Re: [GMCnet] Resonator location [message #343719 is a reply to message #343689]

Mon, 27 May 2019 11:43

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

Is a resonator required on systems with one muffler at the rear? I had an $80 double wrapped, two year old muffler. Have a seam come apart. That caught my floor on fire. So I put a muffle heat shield in above the two front mufflers. Then installed two 40 series Flow Master, welded mufflers. Very strong. I fine the sound fine. But could use a resonator alittle between 1300 to1500 RPM. But then again. I'm not in that RPM range for any real length of time. Bob Dunahugh 78 Royale 403
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Re: [GMCnet] Resonator location [message #343721 is a reply to message #343719]

Mon, 27 May 2019 11:55

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

Bob,
You know if you put on more parts, that can create more issues.
Sound is something that need to be addressed, I know that the single
muffler has that characteristic , so you can consider one. I think Larry
Weidner did something to resolve that issue.
Using cheap mufflers is a poor decision as you never see the condition. We
supply the most robust units so we do not have these issues.

On Mon, May 27, 2019 at 9:44 AM Bob Dunahugh via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Is a resonator required on systems with one muffler at the rear? I had an
> $80 double wrapped, two year old muffler. Have a seam come apart. That
> caught my floor on fire. So I put a muffle heat shield in above the two
> front mufflers. Then installed two 40 series Flow Master, welded mufflers.
> Very strong. I fine the sound fine. But could use a resonator alittle
> between 1300 to1500 RPM. But then again. I'm not in that RPM range for any
> real length of time. Bob Dunahugh 78 Royale 403
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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Re: [GMCnet] Resonator location [message #343722 is a reply to message #343715]

Mon, 27 May 2019 12:37

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

G.M. used exhaust pipes that had unique depressions strategically
positioned around the pipe that performed the duties of mufflers. But, they
had as much restriction as mufflers of the day, and were just as expensive.
Jim Hupy

On Mon, May 27, 2019, 10:30 AM Eric Bornstein via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Don't like the restriction so I may leave it out and if I have a drone I
> may try a resonator tube. I will try the exhaust tip first.
>
>
> https://www.performancetrucks.net/forums/gm-engine-exhaust-performance-21/how-build-exhaust-resonator-tube-eliminate-drone-489463/page2/
> --
> Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over
> blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux
> vacuum,
> fuel tank sealing, rebuilt senders and new rubber, propane hot water
> heater.) Alexandria, Ontario, Canada
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Re: [GMCnet] Resonator location [message #343723 is a reply to message #343721]

Mon, 27 May 2019 13:02

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

Karma: 10

Senior Member

jimk wrote on Mon, 27 May 2019 11:55

B I know that the single
muffler has that characteristic , so you can consider one. I think Larry
Weidner did something to resolve that issue.

Using the "Vibrant 1142 3" Ultra Quiet Resonator" that I got from Amazon, eliminated the undesirable "RAP" that I got from my Flowmaster 70 rear mounted muffler. That resonator is a straight through no restriction resonator. Three inch that you could see through. Many holes in the center pipe allowed sound to defuse into the absorbing material in the rest of the case. Ended up being a good fix for me. JWID

Larry

Smile

78 Royale w/500 Caddy
Menomonie, WI.

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Re: [GMCnet] Resonator location [message #343824 is a reply to message #343723]

Fri, 31 May 2019 18:13

ree_eric

Messages: 43
Registered: February 2004
Location: Alexandria, Ontario, Cana...

Karma: 0

Member

the 3" pipe that passes through the holes in the frame is held by silicon donuts in most of the frames. The double frame that supports the bogies does not have one. My pipe is touching the edge of the hole, am I going to have vibration or noise problems with this? What have others done with 3" pipes? Not looking forward to removing the pipe if fixing involves grinding the hole bigger.

Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux vacuum, fuel tank sealing, rebuilt senders and new rubber, propane hot water heater.) Alexandria, Ontario, Canada

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Re: [GMCnet] Resonator location [message #343825 is a reply to message #343824]

Fri, 31 May 2019 20:00

sgltrac

Messages: 2797
Registered: April 2011

Karma: 1

Senior Member

If you install a flex joint upstream then you can weld a tab to the pipe
and bolt it directly to that xmember if it starts rattling.

Sully
Bellevue wa

On Fri, May 31, 2019 at 5:39 PM Eric Bornstein via Gmclist <
gmclist@list.gmcnet.org> wrote:

> the 3" pipe that passes through the holes in the frame is held by silicon
> donuts in most of the frames. The double frame that supports the bogies does
> not have one. My pipe is touching the edge of the hole, am I going to
> have vibration or noise problems with this? What have others done with 3"
> pipes? Not looking forward to removing the pipe if fixing involves
> grinding the hole bigger.
> --
> Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over
> blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux
> vacuum,
> fuel tank sealing, rebuilt senders and new rubber, propane hot water
> heater.) Alexandria, Ontario, Canada
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Sully 77 Royale basket case. Future motorhome land speed record holder(bucket list) Seattle, Wa.

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Re: [GMCnet] Resonator location [message #343828 is a reply to message #343824]

Fri, 31 May 2019 22:40

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

Karma: 10

Senior Member

ree_eric wrote on Fri, 31 May 2019 18:13

the 3" pipe that passes through the holes in the frame is held by silicon donuts in most of the frames. The double frame that supports the bogies does not have one. My pipe is touching the edge of the hole, am I going to have vibration or noise problems with this? What have others done with 3" pipes? Not looking forward to removing the pipe if fixing involves grinding the hole bigger.

Had mine for 14yrs now with pipe touching the frame hole. No vibration noise, at least none that we can hear. Inspection shows no rubbing there either. Just what I've observed.

Larry

Smile

78 Royale w/500 Caddy
Menomonie, WI.

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Re: [GMCnet] Resonator location [message #343829 is a reply to message #343825]

Fri, 31 May 2019 22:47

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

Vibration is not a concern as the muffler fits snugly against the frame. We
have installed about 30 of these units with the 3" muffler,

On Fri, May 31, 2019 at 6:39 PM Todd Sullivan via Gmclist <
gmclist@list.gmcnet.org> wrote:

> If you install a flex joint upstream then you can weld a tab to the pipe
> and bolt it directly to that xmember if it starts rattling.
>
> Sully
> Bellevue wa
>
> On Fri, May 31, 2019 at 5:39 PM Eric Bornstein via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> the 3" pipe that passes through the holes in the frame is held by silicon
>> donuts in most of the frames. The double frame that supports the bogies
> does
>> not have one. My pipe is touching the edge of the hole, am I going to
>> have vibration or noise problems with this? What have others done with 3"
>> pipes? Not looking forward to removing the pipe if fixing involves
>> grinding the hole bigger.
>> --
>> Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over
>> blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler,
> aux
>> vacuum,
>> fuel tank sealing, rebuilt senders and new rubber, propane hot water
>> heater.) Alexandria, Ontario, Canada
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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Re: [GMCnet] Resonator location [message #343837 is a reply to message #343829]

Sat, 01 June 2019 10:37

ree_eric

Messages: 43
Registered: February 2004
Location: Alexandria, Ontario, Cana...

Karma: 0

Member

Thanks for the advice. Now for the resonator tube. I was going to wait till I tested to see if I had any resonance but it is easier to weld it in while it is out on the floor. I have the 3" pipe leftover and research on the net suggests that 32" long is good for eliminating resonance from a V8 at around 2200 rpm. 32" is where the piece of wood is. Thoughts?

http://www.gmcmhphotos.com/photos/data/3/Resonator_tube.jpg

Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux vacuum, fuel tank sealing, rebuilt senders and new rubber, propane hot water heater.) Alexandria, Ontario, Canada

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Re: [GMCnet] Resonator location [message #343839 is a reply to message #343837]

Sat, 01 June 2019 16:03

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

You should have taken the two pipes and joined it to 3".
Look at our website and see how we do ours. Your chocking it down.

On Sat, Jun 1, 2019 at 11:17 AM Eric Bornstein via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Thanks for the advice. Now for the resonator tube. I was going to wait
> till I tested to see if I had any resonance but it is easier to weld it in
> while it is out on the floor. I have the 3" pipe leftover and research on
> the net suggests that 32" long is good for eliminating resonance from a V8
> at around 2200 rpm. 32" is where the piece of wood is. Thoughts?
>
> http://www.gmcmhphotos.com/photos/data/3/Resonator_tube.jpg
> --
> Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over
> blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux
> vacuum,
> fuel tank sealing, rebuilt senders and new rubber, propane hot water
> heater.) Alexandria, Ontario, Canada
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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Re: [GMCnet] Resonator location [message #343851 is a reply to message #343839]

Sun, 02 June 2019 12:11

ree_eric

Messages: 43
Registered: February 2004
Location: Alexandria, Ontario, Cana...

Karma: 0

Member

Don't see where my restriction is. Is it at the Y? The 3" pipe I would add is T'd off the 3". Where do I find how you do it on your site?

Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux vacuum, fuel tank sealing, rebuilt senders and new rubber, propane hot water heater.) Alexandria, Ontario, Canada

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Re: [GMCnet] Resonator location [message #343852 is a reply to message #343851]

Sun, 02 June 2019 13:10

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

Eric,
Go to our we site under exhaust and click on the pictures and you'll see
how the two 2.5 join in to the 3".
Your combining 2.5 to 2.5 from the pic I see.

On Sun, Jun 2, 2019 at 10:32 AM Eric Bornstein via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Don't see where my restriction is. Is it at the Y? The 3" pipe I would add
> is T'd off the 3". Where do I find how you do it on your site?
> --
> Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over
> blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux
> vacuum,
> fuel tank sealing, rebuilt senders and new rubber, propane hot water
> heater.) Alexandria, Ontario, Canada
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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Re: [GMCnet] Resonator location [message #343853 is a reply to message #343689]

Sun, 02 June 2019 13:13

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

The way LarryW did it is correct.

On Sun, Jun 2, 2019 at 11:10 AM Jim Kanomata wrote:

> Eric,
> Go to our we site under exhaust and click on the pictures and you'll see
> how the two 2.5 join in to the 3".
> Your combining 2.5 to 2.5 from the pic I see.
>
> On Sun, Jun 2, 2019 at 10:32 AM Eric Bornstein via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Don't see where my restriction is. Is it at the Y? The 3" pipe I would
>> add is T'd off the 3". Where do I find how you do it on your site?
>> --
>> Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over
>> blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux
>> vacuum,
>> fuel tank sealing, rebuilt senders and new rubber, propane hot water
>> heater.) Alexandria, Ontario, Canada
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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Re: [GMCnet] Resonator location [message #343855 is a reply to message #343853]

Sun, 02 June 2019 17:00

ree_eric

Messages: 43
Registered: February 2004
Location: Alexandria, Ontario, Cana...

Karma: 0

Member

Jim,
The pipe at the junction of the Y is a 3", must be the poor quality picture of mine.

Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux vacuum, fuel tank sealing, rebuilt senders and new rubber, propane hot water heater.) Alexandria, Ontario, Canada

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Re: [GMCnet] Resonator location [message #343857 is a reply to message #343855]

Sun, 02 June 2019 17:43

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

Ok , Thank you.

On Sun, Jun 2, 2019 at 3:01 PM Eric Bornstein via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Jim,
> The pipe at the junction of the Y is a 3", must be the poor quality
> picture of mine.
> --
> Eric & Ree '74 ex-Sequoia (parts) '75 Eleganza (TB, exhaust x-over
> blocking plates, Manny reaction arms and discs, 3"exhaust rear muffler, aux
> vacuum,
> fuel tank sealing, rebuilt senders and new rubber, propane hot water
> heater.) Alexandria, Ontario, Canada
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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