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it's pretty simple.
with N/A cars, you're adjusting the exhaust velocity at a given rpm, by messing with piping diameter.
if you go with smaller pipe diameter, you get great velocity at lower rpm's and you wheeze uptop as the piping proves insufficient for the flow generated by elevated revs.
if you go with MASSIVE pipe diameter, you get great potential for velocity at high rpm's and you suffer down low, because the exhaust cfm isnt sufficient to take advantage of pipe diameter and be ushered away from the engine. It just kind of puffs out and lingers in the piping, while pulses from behind ram into it and cause issues with flow laminarity.
of course there is one caveat to massive pipe diameter: sure you can build an exhaust capable of ushering large mounts of gas away from the engine quickly and smoothly, but at that rpm level, is your engine capable of producing that level of cfm or is the volumetric efficiency crappy and the motor running out of breath?
these are the questions of our times....
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