I'm using the weapon-r hyper intake I got from spomotorsports that combined with a 5 zigen fireball catback exaust. I've definately noticed a major increase in upper end power but a little loss in lower. The price was about 190.00 with tax and it sounds oh so good when you step on it around 3500 r.p.m.'s. There is no sound when your just driving around, you only here it when you want to. I also took a pair of my wifes pantyhose cut of the end and placed it over the filter for extra protection from dust. I found overall performance has definately improved.