FN2 Headers or Flash pro?

[u mad?]

IMO if you aren't working the engine with cams and supporting mods PLUS the tune - there is no point in anything less.
Just put on any CAI and a muffler and feel the noise and bonus of not being any slower than a car with I/H/E basic mods.

x2

at least I/H/E and tune, other wise don't bother

your 150db fart canon aint ganna give you any more power by itself