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Duals w/o Headers

This is a discussion on Duals w/o Headers within the External Engine forums, part of the LSx Technical Help Section category; I'm thinking about getting a dual exhaust X pipe set up w/o headers. I just don't want to mess w/headers ...

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    FAS02SS
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    Duals w/o Headers

    I'm thinking about getting a dual exhaust X pipe set up w/o headers. I just don't want to mess w/headers and all the emission control removal. Any guess on hp gains and how about some muffler suggestions.

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    Pathelogical Liar BlackLT1Z28's Avatar
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    Quote Originally Posted by KM02SS View Post
    I'm thinking about getting a dual exhaust X pipe set up w/o headers. I just don't want to mess w/headers and all the emission control removal. Any guess on hp gains and how about some muffler suggestions.
    With stock manifolds, I'm thinking you'll see similar results as a catback setup. And without LT headers, you'll have to fab up some stuff so the true duals will fit to the stock manifolds, but I'm not completely sure about that for the LS1. I know you would for the LT1 though.

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    Quote Originally Posted by KM02SS View Post
    I'm thinking about getting a dual exhaust X pipe set up w/o headers. I just don't want to mess w/headers and all the emission control removal. Any guess on hp gains and how about some muffler suggestions.

    I have duals using the stock manifolds and stock catalytic converters. Both 2 1/2 inch pipes go side by side down the passangers side in the same place as the stock pipe runs (they will fit perfectly in that location), then go over the axle with both pipes. (Without that stupid "Y" pipe, there is much more ground clearance). The mufflers are straight through, noise cancelling MagnaFlows, one located on each side of the rear tub. You will have a great tone but it will not be overly loud. Both pipes exit from beneath the bumper in the stock location. Dyno test showed a 15 horse power gain with this dual setup over that stupid "Y" pipe system and SLP's LoudMouth muffler that I had on the car before the dual installation. (Oh yes, I forgot to say that I used a "H" pipe to equalize the pressure between the two pipes).
    Last edited by JEB; 10-18-2006 at 08:16 PM.

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    Senior Member mrr23's Avatar
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    Quote Originally Posted by KM02SS View Post
    I'm thinking about getting a dual exhaust X pipe set up w/o headers. I just don't want to mess w/headers and all the emission control removal. Any guess on hp gains and how about some muffler suggestions.
    bassani makes a tru-dual system that bolts to the factory manifolds and cats.

    http://www.stealthram.com/2000pontiacformula.html my car with bassani tru-duals
    Last edited by mrr23; 10-20-2006 at 01:37 PM.

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    FAS02SS
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    Was this a custom setup? Do you have pics?

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    Senior Member mrr23's Avatar
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    if you are asking me, i provided a link to my webpage, so you can see the pics i took.

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