Quote:
Originally Posted by SiVX
This calculator is really complicated. I'm new to EcoModding. I just got a VX that has a 3" aftermarket intake. The exhuast pipe was replace from the engine back and has a 2007 Si muffler. I guess tomorrow I'll take some diameter measurments n figure out what else I need. 
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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.