Thread: is back pres. good 4 NE thing?

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I have no idea how much backpressure is required, or evn a way to determine home much is too much other then on a chassis dyno and playing with different exhuast systems. I do know that I once had a V-8 powered Pinto that was a bit more then a 10th faster through the exhaust then with the headers open!!!

The only motors I have seen that don't respond to a bit of backpressure is hi-rpm motors running mechanical fuel injection. I suppose on the latter it's a matter of runner velocity overcoming the need for scavenging??? I'm sure one of the engine therorists has some numbers on the back pressure amounts.

As Matt said, a good 2 1/4" or 2 1/2" exhaust system with chambered mufflers and either an H or an X pipe will give you good power and give it sound rather then noise!!!!