Originally posted by epoxy
hm.. for your header question...
4-2-1 header for torque...4-1 header for midrange-highend performance.
basically a track/street question. (racing from stoplight to stoplight, or from 45mph+ hehe)
i have an apex'i world cat back exhaust... nice deep sound, and produced a nice gain. i'd recommend greddy evo though..
i have dc 421 ceramic headers, and they are just dandy :-P
There's no bolt in 4-1 header with the exception of the Kamikazee which is a POS for NA motors. If I had to do a header again I would search high and low for a good condition Mugen, and nothing else. For catbacks I also run the WS and I like it but it's for cruising and not power, it may make a few hp but it's not an all out N1 style like the Apex N1 or Tanabe Racing Medallion. Personally I think that just about all bolt ons for the 5th Gen dont mean crap. A DC/N2 header, Apex WS exhaust, and AEM or Iceman intake will ad at most 8-10 hp to the wheels.