Quote:
Originally Posted by Redcap
A complete myth.
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True, put a wet rag in your mouth and tell me if you run a marathon faster.
No engine made likes back pressure. Your gain in torque was possibly from increased exhaust velocity. This is why some engines will run better overall with a 2-1/5 inch pipe over a 3 inch pipe. There is more exhaust velocity a lower rpm/smaller engine will get more flow from a small pipe over a 3" pipe!
Apply this to cyl heads as well on the intake port runners
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