Gutting a stock downpipe? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 03-08-2006, 02:39 PM   #11
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Get some pics of the car...and get a plan for straight as you can go....duals would be nice too.
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Old 03-08-2006, 02:45 PM   #12
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Whats with the double wall down pipe? There really isn't a pipe in the pipe is there?

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Old 03-08-2006, 02:46 PM   #13
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I thought it was more of a flexilbe braided hose. Similar to what the imports use to connect right off the motor for flexing.
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Old 03-08-2006, 02:51 PM   #14
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Quote:
Originally Posted by BillBoost37
I thought it was more of a flexilbe braided hose. Similar to what the imports use to connect right off the motor for flexing.
Does this create a slowdown in the exahust?

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Old 03-08-2006, 02:52 PM   #15
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No idea..never seen one..only heard about it.

Far as I know..DP'* never rust out because of the heat.
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Old 03-08-2006, 03:38 PM   #16
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Quote:
Originally Posted by jr's3800
Whats with the double wall down pipe? There really isn't a pipe in the pipe is there?
It'* a pipe in a pipe. The one inside is thin walled and only has a lip that holds it in. It slides in and out a little bit. I'll take a pic tonight. I will NOT be proceeding with this process as per the post by Ben. The info crossed our desks and we agreed it would not be beneficial until he got bigger pipes behind it. Of course, if someone wants to send me a spare down pipe I'll try and gut it for you and you can give it a shot. I would strongly suggest heat wrapping it so that you don't heat up the firewall and blower motor housing. It'* my assumption that is the purpose of it. The outer pipe is just to keep it from getting to hot in that spot. Plus heat wrapping keeps the heat in the pipe. Hotter exhaust flows faster doncha know!



P.*. I told Ben wrong. It was actually 25-30rwhp lost with the big into small pipes....
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Old 03-08-2006, 04:27 PM   #17
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Quote:
Originally Posted by BillBoost37
Let'* take a moment and thank these two guys for gutting, gluing, reaming and dremeling this car away in the interests of power.

Guys...credit where it'* due.. you are doing stuff most of us are afraid to try on our cars. Make it work and we will follow.

I'll just ASSume I'm part of "these two", and say thank you for that praise. Most of all it should go to Ben for being the test subject to all of this, and his wife for putting up with it.....
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Old 03-08-2006, 05:50 PM   #18
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Quote:
Originally Posted by jr's3800
Whats with the double wall down pipe? There really isn't a pipe in the pipe is there?
thats what mine had, but i cant speak for the Bonnevilles as ive never seen one cracked open.
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Old 03-09-2006, 12:49 AM   #19
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You can see the edge of the sleeve inside the downtube in this pic. It isn't attached to anything like a flexpipe.



And the little expanded section at the bottom of the pipe which is seemingly the only thing, aside from the bends in the tube, holding that sleeve in.
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Old 03-09-2006, 03:04 AM   #20
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Great pics, Doug. It really shows how the two pipes are situated.
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