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From: Sooke , B.C. Canada
Car: 89 rs camaro
Engine: 5.0
Transmission: 700r4
Axle/Gears: gm 7.5, 4.11 gears
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whats the average horse power gain from going from stock exhaust to long tub headers and dual 2 1/2 inch flowmaster exhaust
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Conventional wisdom says around 10%. Depends upon how bad what you've got really is.
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Stock TBI 305? It isn't going to help much. You'll need your O2 sensor if still TBI.
It's really hard to answer questions like this without knowing exactly what you've got. If you have a 500 horse 434 CID fire-breather, then a stock 2-1/4" TBI exhaust is going to choke it to death and your longtubes & duals will do it wonders. But, the stock TBI exhaust isn't all that bad on a stock TBI engine - not great, understand, but it won't make as much difference as it would with that imaginary 434.
It's really hard to answer questions like this without knowing exactly what you've got. If you have a 500 horse 434 CID fire-breather, then a stock 2-1/4" TBI exhaust is going to choke it to death and your longtubes & duals will do it wonders. But, the stock TBI exhaust isn't all that bad on a stock TBI engine - not great, understand, but it won't make as much difference as it would with that imaginary 434.
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