Custom exhaust any interest?

roccodart440 said

Collector extensions do make more power (if they are the correct length) but they are typically the same diameter of the existing collector or a 1/2 inch step. So again, if you kept the whole system the size of the collector, in a perfect world, that would be better than a step down or multiple step downs. I.e. 3.5" collectors to a 2.5" system.

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I guess I'll just have to test it out. I generally agree a full length 3.5" system would be freer flowing, but dual 3.5" is way more than I need. You really have to be putting down some serious power levels to even need dual 3". That's 4 digit power territory there. This is why I'm sticking with 2.5. my combo as is will do very good to go north of 475 at the crank.