Will an X pipe add backpressure?
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Junior Member
Joined: Sep 2011
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You never need backpressure, street or strip. The reason the open headers have moved the power band is because there isn't a long enough run for scavenging the other cylinders to take place at lower rpms. Once you get into higher rpms there is less time needed to help scavenge the next cylinder because the gases are still in the system when the other one is on the exhaust stroke. At lower rpms the gases from one cylinder are far enough gone to not help the next, so that cylinder has to exert more force to push the gases out of the cylinder into the atmosphere.
It sounds like you've got it pretty well put together now, X pipe as close to the front as possible, muffler as far back as necessary, and size your pipe correctly and it'll be fine.
It sounds like you've got it pretty well put together now, X pipe as close to the front as possible, muffler as far back as necessary, and size your pipe correctly and it'll be fine.
I Voted For Bill and Opus
Joined: Nov 2007
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From: Cheyenne, Wyoming
An exhaust cross over (X pipe)improves exhaust flow, and is superior to a straight true dual setup. The advantage comes from the scavenging effect exhaust pulses traveling down the exhaust tubing have, one pulse pulling the exhaust pulse coming along behind it with an X pipe cross over both engine banks are helping, you have 8 cylinders pulling instead of 4. This is why you can get better flow out of a properly setup single exhaust over a badly set up dual system.
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Joined: Nov 2011
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Just cut a hole in the hood and put a CDC Shaker scoop on there, your problems are solved. It's the amount of air going in that makes the power. MAF position critical.
Last edited by papa tiger; Feb 7, 2012 at 08:18 PM.