well i got a catback exhuast i put on a airaid intake like 3 weeks ago felt alot of difference then i put the airaid throttle body spacer a 2weeks ago and felt a big difference on that as well im not sure if it does much on its own but it made a big difference with mine i think you get even more horsepower wihen you combine the mods i noticed better shifting and way faster respons from the pedal for a 100 bucks its deffinatly worth it and its easy to install