Quote:
Originally Posted by spdbrake
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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All things are not equal, higher back pressure will yield lower volume and less velocity from the outlet of the 3.5" pipe. The velocity might be higher at one of the small holes at the muffler proper but by the time ii travels through the large pipe diffuses and makes a 90 D turn it has both lower volume and lower velocity because it has already expanded. The VE of the engine is negatively effected by the back pressure created by the Flowmaster. We have not blown over one pylon since installing these mufflers we usually got at least one every two events with the straight through design.