My my99 has a APS CAI and unichip. $400 for the CAI was probably not good value as would only give 2 to 5 extra kw. I got mine used off this forum for $240. With a vf34 and bigger IC it is becoming worth doing. No downside in my experience just a ghastly noise from the blow off valve. Some people like hearing the intake noise. As blackmy03 says you do not need big name equipment for this, you can DIY.