Not sure which 2003 Nissan Maxima Air Intake Systems are right for you? We have over 457 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Ronald W from Saint Peters, MO said, "The performance difference is VERY noticeable...6000rpm comes up QUICKLY! Noise level is not excessive..not noticeable unless you really get into the throttle. Nice!Car was fast, now it's a BLAST!"