ive seen pretty ridiculous dynos from most of the major companies, and everyone will give u a different answer. but i'd have to say im more than satified with my injen. other guys might suggest aem or fujita. anythings better than the stock airbox that thing is stupid restrictive. most impressive dyno # ives seen have been from the injen, with fujita 1-2hp behind and aem 0-1 hp behind fujita. but theres so many cars, setups and climates out there they all could be the same. ;p