I'll second TwoBills on this one. Throttle body spacers work on carberated vehicles where the air and gas are mixed, providing extra time for the mixture to combine. Hoowever, with fuel injected engines where the fuel is sprayed through the injectors into each cylinder, there is no added incentive to having a throttle body spacer. Plus, I've heard the Frontiers make a godawful wheezing sound with them on. I installed one on a fuel injected F-150 and noticed absolutely no difference in performance or throttle response. Just my .02 though, let us know how it works for ya.