Post by
nametakennow »
https://forums.nicoclub.com/nametakennow-u713.html
Wed Feb 28, 2007 4:12 pm
Intake - NISMO, AEM, Injen, othersExhaust - BRM, NISMO, HKS, Stromung, Thermal, othersHeader - Hotshot, NISMO, OBXHigh-flow cat (still legal, but more power) - BRM offers Magnaflow, you could also order directly from Magnaflow or a whole list of other cat makers
Specs love bolt ons. All of that will give you 30-40hp (at the crank, not the wheels).
You could also go for a balance shaft removal kit from JWT and get several more, and cams from JWT or NISMO if you want even more power.
Some 2.5s have been turbo'd without issues, in fact there's one here on NICO, but if you only want a nudge more power, there's no point in risking bent rods.
The NISMO stuff won't void your warranty. The other stuff might, but shouldn't, depends on dealer.
The stock precat (in the header) is known to disintegrate and be sucked back into the cylinders, so a header is not only better for power, but it also gets rid of that risk. Make sure to relocate your 2nd O2 sensor behind the cat or get an O2 sim and you'll still pass OBDII tests.