I/H/E gains
 

i know the gains from these arent that much but still noticables. i just wanted to kno, ii have intake/headers. the intake is noticalbe but the headers arent tht noticable. if i get the megan drift spec will the headers be more noticable? im guessing its not noticable rite now cause after the headers i have the cat and 1" piping running to a stock muffler which goes from the right of the car and wraps around to exit out the left. lots of bends. also i was kinda pissed when i found out the megan drift spec follows this path and also exits out the left. just not as many bends

RE: I/H/E gains
 

Mostly, any gains you'll feel from a header are due to the placebo effect. This is not to say that you will not experience gains of any kind, just that 3-5 hp is not going to be felt.

RE: I/H/E gains
 

6 to 8hp max with name brand stuff. More of a throttle response mod than anything.