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FastShark85 · 09-17-2003, 04:51 PM

Lenght is important with headers, but that's directly related to equalizing pressure for the exhaust. Peryn is right that backpressure is more important than exhaust length.

Some cars need a little backpressure, or else unburnt fuel can be sucked out of the exhaust valves before it is burnt as well as its intended. This partially depends on valve timing, too.

I have an "X" shaped crossover that equalizes backpressure behind my exhaust manifolds. I suspect headers would help, too, but just adding the crossover increased my HP noticeably. The guy who made the x pipe dyno'ed it and claims an increase of about 30 HP. I don't know if it's that dramatic, but I did notice it immediately.

09-17-2003, 04:51 PM	#4 (permalink)
FastShark85 Psycho Location: In the garage, under the car.	Lenght is important with headers, but that's directly related to equalizing pressure for the exhaust. Peryn is right that backpressure is more important than exhaust length. Some cars need a little backpressure, or else unburnt fuel can be sucked out of the exhaust valves before it is burnt as well as its intended. This partially depends on valve timing, too. I have an "X" shaped crossover that equalizes backpressure behind my exhaust manifolds. I suspect headers would help, too, but just adding the crossover increased my HP noticeably. The guy who made the x pipe dyno'ed it and claims an increase of about 30 HP. I don't know if it's that dramatic, but I did notice it immediately. Last edited by FastShark85; 09-17-2003 at 04:54 PM..