hey, im very close to finally doing my headers and the rest of the exhaust system. i was just wondering if it was worth it for me to actually go thru with it, i mean it is a lot of $, and i want to know what it will really do. well, i have a 92 305 tbi. i plan on putting on the hooker comps, than running a single 3" pipe to my flowmaster 50 3 chamber mufflers. now i want to know, what difference in horsepower, am i looking at? and what difference in 0-60 will it make? i already have the k&n airfilter put on. please let me know the difference in hp thanks.

DOZER80464@aol.com

 

exhaust doesn't add horsepower, it just frees up horsepower that is lost by your engine's lack of breathing. a new exhaust system will give you the power that you would have otherwise lost, and the more modifications you do the more important it is to have a less restricted exhaust system. hope this will clear things up for you.

 

Its worth it. May not be cheap, but as soon as its all done it'll take a week before you stop grinning like a fool. I can't wait to have the $$ together for the headers and high flow cat. (I could just ditch it but the flowmaster sounds much better with one IMO, plus no funky smell) Just putting the cat back on mine made it sound way better, and it pulls noticably better up top. I'll bet it'll take more than 1/2 second of your 0-60 if you do the whole system, headers to tailpipes.

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88 Camaro (not an RS, or an IROC, justa camaro.)
305TBI/700R4/2.73
14" Open Element and Flowmaster 80 seires

Next up: headers and gears

 

I went SLP headers and catback with a Catco cat and yes it does free up alot of HP even on my 305 TPI. As I found out when you do that either make your own or invest in a new way of getting more air in the motor and that will also free up some more horses along with the headers.

 

Don't mean to get off topic, but what's your point? Power is the rate at which work is done - if the stock exhaust inhibits the rate at which work is done, and an aftermarket exhaust allows more work to be done in the same amount of time, haven't you just added power? Besides, he didn't even use the words "add horsepower". Engines are often described as air pumps, the rate at which air is moved being the "power", and the restrictive factory exhaust system reduces the amount of air the engine can pump, thereby reducing the "power" produced, etc., etc., etc.

I'll say it: Good headers and a high flowing exhaust will "add horsepower" to your car - i.e., enabling it to increase (add to) the rate at which work is performed. You can expect about a 20 hp increase or better, depending upon what else you do to optimize the flow increase.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).