Quote:
Originally Posted by Blu3Z3rg
Once it gives you a length, if you go for a 3" fart can after that length, it's probably just like dumping it in the air anyways. That calculator is a bit on the tricky side, and isn't very descriptive of the measurements, but it's pretty accurate when you put more and more info in it.
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A 3" fart can will still cause turbulence at the end of a much narrower (typically 2 - 2.25" ) tube. For all the sound muffling qualities it gives you (probably none), it's better to just dump to atmo. Been there, done that... really bad idea.
Honda stock mufflers from higher displacement variants are an excellent way to improve engine efficiency, gain a little bit of power, and keep the vehicle sounding sweet.