Thread: exhaust pipe diameter
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09-24-2010 10:08 PM #1
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Not original with me – but should help
Exhaust Pipe Size Estimate: A good section of straight pipe will flow about 115 CFM per square inch of area. Here’s a quick table that shows how many CFM each common pipe size will flow, as well as the estimated max horsepower for each pipe size. NOTE: These numbers are just estimates. All pipes are assumed to be 16 gauge steel.
The table above is probably over-estimating pipe size, but you can see that a 400 hp vehicle with a dual exhaust system only needs 2 1/4 – 2 1/2 inch pipes. Anything larger is overkill."Where the people fear the government you have tyranny. Where the government fears the people you have liberty." John Basil Barnhil
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