question: Series One true dual exhaust. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-16-2007, 09:42 PM   #1
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Default question: Series One true dual exhaust.

i've been doing some brainstorming but i don't have my motor on me (it'* being stored at a freinds house.

i was wondering about using two front manifolds (which flows better than the rear anyway) allowing the front to curve over the transmission like normal, but instead of connecting to the rear just continuing down under the vehicle.

the front manifold would be cut off and would curve down under the car, staright into sidepipes...

i'm really just throwing this out for opinions and "you can't do thats". i have slightly more firewall space to the rear than a bonneville. but i'm wondering if i can get a large enough radius down or if the curve down would negate any gain from using the front manifold on the rear.

opinions?
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Old 03-16-2007, 09:52 PM   #2
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the only problem I see is the second cat...would you have one? and where would you put it? and the only other thing would be road clearance, but other than that, if done right, it sounds possible.
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Old 03-16-2007, 09:53 PM   #3
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Default Re: question: Series One true dual exhaust.

Hmmm...I don't see why not....though I'm a little fuzzy on how you are going to get a front manifold to fit on the rear and clear the belts without some major cut and paste.

Seems like it would be easier to lop the header flange off and make up your own tubes and collector for the rear manifold...bring the tubes straight out, down, and together at a collector, a little to the right of the normal location in the "transmission tunnel" (for lack of a better word) Giving you a little more room to bring the front bank pipe down the tunnel parallel to it.
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Old 03-16-2007, 09:55 PM   #4
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Quote:
Originally Posted by wjcollier07
the only problem I see is the second cat...would you have one? and where would you put it? and the only other thing would be road clearance, but other than that, if done right, it sounds possible.
Not a big problem, there'* a few inline cats that are pretty easy to mount up. They look like the old "cherry bomb" glass-packs, but are really cats. You could cram a pair in the tunnel side by side.
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Old 03-16-2007, 10:04 PM   #5
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inline cats would be a real possibility, even side by side traditional cats would be no problem (i'm a u-body) that aside being a race only drag vehicle i might leave the cats out all together...
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Old 03-16-2007, 10:27 PM   #6
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Why would you want to would be my first question.

Is it worth the cost of fabrication? Possible, sure. Practical? No. I'm not being held back by my exhaust. There are more severe restrictions in your motor to worry about first.

Unless you just wanna do it so you can say you didit.

Here are our top 25 quickest Bonnevilles:
http://www.rogue-cavern.net/fwdquarter.html

Why are none of them (including the 600hp 200mph Spirit of Bonneville) running true duals?
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Old 03-17-2007, 03:28 AM   #7
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No real reason too. The most powerful setups on RWD V8 cars are those with an X pipe after the headers. There are also no headers for the series I, and you're adding complexity and weight to the setup regardless.

Max power would be achieved with a good pair of headers (SII) or PEMS (SI), free flowing components, and correct piping, that'* as straight as possible.

Silverbullet'* exhaust would be a great setup to look at.
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Old 03-17-2007, 09:33 PM   #8
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One thing to think about is that these 3800'* are torquey. It'* the torque that gets our cars to the 1/4 mile quickly. If you free up the exhaust too much, you'll be losing that much needed torque.
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Old 03-18-2007, 04:34 PM   #9
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a little bit more brainstorming in my twisted little mind brough me this idea. using the normal front manifold on the front and an f-body passenger manifold on the rear. i can't seem to find a picture of it but hopefully it dumps more down than back. that would allow simpler fabrication of dual exhaust.

i know that there would be a loss of low-end torque, but i'm hoping that the high end gains will negate it. especially with the bottle. besides, sidepipes rock.
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Old 03-18-2007, 04:52 PM   #10
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I can just about see exactly what you are getting at... LOL.... That will sure be interesting

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