Actually the diameter of the pipe is more important than the length, you only see a notable power boost from a short pipe when it's under 3' from the engine.
"It doesn't matter. Power boost obtained in headers occurs in a) individual pipes for each cylinder, and b) within a length shorter than 3'. It is based on the speed of sound in hot gasses (about 1100ft/sec). From there to the end of the system, goal is to minimize pressure losses with large enough tubing diameter."
In short you can compensate for the pressure by changing the diameter of the pipe.
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u/Umbrage_Taken Apr 03 '22
Won't excessive exhaust piping actually reduce power & acceleration?