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Reload this Page um.. no mufflers = less power ??
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Old 04-28-2004, 02:20 AM   #7
JBeryleC
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Join Date: Jul 2003
Location: Sebastopol CA
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Originally posted by Red Mustang Gt 46
The HP gained is usually in the upper RPM's...with an open exhaust. Since 4.6's have a mild compression ratio, back pressure is needed to have a complete burn within the cylinder, if you were running 10:5 compression or higher...back pressure has a minimal effect...in my experience. (I am no expert)...
Ok.. did you lose any low-mid power when you did your exhaust?
I know that there is a claim of HP gains with exhaust systems, but thats just in the higher rpm's...

Wondering if you lose a little low end with a cat-back system, since it loses a lot of back pressure...

???
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