FC Questions.
 

Hi, i was wondering if a dual apex n1 exhaust will raise or drop my horse power on a NA. I thaught because the stock exhaust was dual that it would raise it. if u know for sure, PLEASE let me know.

it "should" increase HP depending on the rest of your exhaust set-up.

i.e. if you have a straight pipe (or gutted cats) then you may loose low-end HP because there is not enough backpressure, but you'll gain HP in the high-end.

Why do people still think backpressure is necessary? (Besides for activating the 6-port actuators)

You got me.