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Exhaust Science Demystified

I was looking for an old exhaust collector test when I ran across this. It is a good read with alot of info that explains in detail how an exhaust system works,more detail than most of us need but it explains things like..Why is 3" exhaust is NOT needed on most street cars...period. Also how mufflers should be picked by flow rate if you are looking for power...and so on & so on.

http://www.superchevy.com/technical/engines_drivetrain/exhaust/0505phr_exh/index.html
 
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