| [GMCnet] Flowmaster 70 [message #94513] |
Tue, 03 August 2010 18:32  |
pete lyons
Messages: 81
Registered: June 2010
Karma: 0
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I'm guessing the propane connection needs to be relocated to install the flowmaster 70?
Has anyone run one of these in the rear without a heatshield?
Thanks in advance! A few hours closer to being back on the road!!!
Pete Lyons
New Albany IN
Optimus prime
Sent from my iPhone
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| Re: [GMCnet] Flowmaster 70 [message #94543 is a reply to message #94513] |
Tue, 03 August 2010 23:54  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Do NOT run without the heat shield. We just had a coach burn and it caught fire around the rear muffler that was missing a heat shield.
I re-routed the propane line slightly. I do not remember exactly what I did. I remember redoing the one copper line back there that came through floor from the tank. Everything else is original.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Flowmaster 70 [message #94564 is a reply to message #94513] |
Wed, 04 August 2010 08:26 |
rvanwin
Messages: 325
Registered: April 2007
Location: Battlefield, MO
Karma: 6
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| pete lyons wrote on Tue, 03 August 2010 18:32 |
I'm guessing the propane connection needs to be relocated to install the flowmaster 70?
Has anyone run one of these in the rear without a heatshield?
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Yes, you should use the heatshield. I put the one that came with the Flowmaster. I had to trim it some to get it to fit up on top.
Yes, the propane line runs right where the muffler goes. I re-routed mine. Where it goes to the floor, I routed it to the rear then crossed the frame rail aft of the muffler then back to the original line. I also put a length of rubber hose around the copper tubing to prevent pebbles from the tires doing damage and to insulate the tubing where it goes over the tail-pipe.
Randy & Margie
'77 Eleganza II '403'
Battlefield, MO
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| Re: [GMCnet] Flowmaster 70 [message #94579 is a reply to message #94513] |
Wed, 04 August 2010 10:39 |
philipswanson
Messages: 282
Registered: January 2004
Karma: 0
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Senior Member |
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Better to leave the mufflers up front. The heat given off with a straight through muffler is about the same as an equal section of exhaust pipe. This is a myth that they are hotter from people running stock type mufflers where it is true. It is much quieter inside the coach to cancel the exhaust noise as early as possible in the system. Also recommend Magnaflow mufflers too because the GMC is tough on mufflers and they are lifetime guaranteed. Best place to get them is on Amazon. $98 each delivered. Such a sweet deal. No tax, no shipping charge. Check out your Flowmasters, I think they are six months. Where did I learn all this, from Ed Hanson in San Diego. He is our exhaust guru in this neck of the woods. He has done many thousands of custom hot rods and motorhomes. Even he couldn't touch that price on the Magnaflows though.
Phil Swanson
77GMCPB
[Updated on: Wed, 04 August 2010 16:05] Report message to a moderator |
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