Originally Posted by
pani_k
A full cat back system and a 4-2-1 manifold from Piper, Millitek or the ST170 manifold WILL produce noticeable gains. A panel filter would produce negligible gains but I always feel it should be done in conjunction with an exhaust.
what is noticable? the std injectors wont have more than 10-15bhp overhead in them, and thats hardly worth it imo