Well from what you say I beleive you mean just replacing the filter with a k&n, there was a dyno done and showed no gains, if you wnet with a cold air intake there were gains. Checnk of www.reverendbiker.com under frontier modifications for the dyno. I also ordered my grille off of ebay and it was pretty good quality. I will post a pic this afternoon for you. If you like the chromed nissan wheels go for it.