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[quote= This car can blow a pylon down with the 2.5" ID steel packs it can't with the Flowmasters
so I am guessing exhaust volume/velocity is reduced which will kill power .[/QUOTE]
All thing being equal same rpm etc... the higher velocity pipe will be a choke point. Same as putting your thumb over a water hose end.
Empty a balloon into a drinking straw and it will blow out a candle. Empty the same ballon into a paper towel tube and it usually won't blow it out.
The balloon in the paper towel tube will deflate faster as well.
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