Exhaust holding me back?
12-05-2004, 08:47 PM
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Car: '89 RS
Engine: 383 in progress
Transmission: TH 700-R4
Exhaust holding me back?
I have a 350 with around 300+ hp and sad to say, I still have the good ole stock exhaust with the cat cut out with summit brand headers with the flowtech y-pipe. How bad do you guys think this 2.25" piping, stock muffler and crappy headers / y pipe are holding me back????
12-05-2004, 10:07 PM
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Car: '89 RS
Engine: 383 in progress
Transmission: TH 700-R4
What about with headers? If I was to replace these headers with some hooker LT's (2210) and the hooker aerochamber cat back, what gains should i see from that? Thanks 
12-05-2004, 10:28 PM
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Car: 1986 Camaro Z28
Engine: 400
Transmission: T5
Axle/Gears: 10 bolt Posi 3.73
I don't know much about motors, I'm learning, but from what I know and have read, it'd help you alot. I think.
12-05-2004, 10:54 PM
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Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
Sorry, i meant if you have stock exhaust and manifolds you will probably gain 25hp with exhaust and headers.
12-05-2004, 11:01 PM
#6
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I had kind of the same problem not too long ago. Stock manifolds, Y pipe, and I pipe. I think I picked up alot more than 25 hp with headers and a 3 " cat back. In your case it really depends on how good your engine combo is and how bad your exhaust is restricting it.
12-06-2004, 07:15 AM
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Car: '89 RS
Engine: 383 in progress
Transmission: TH 700-R4
rjmcgee, what exhaust did you end up going with?? I am looking into the hooker aerochamber or a flowmaster system.
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12-06-2004, 06:14 PM
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Car: 87 Firebird
Engine: 305 LG4
Transmission: THM700R4
So what your saying is you have the stock cat back on your car. If you really have around 300 hp I would say you should gain at a minimum 15 hp with a good 3" mandrel bent catback.
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