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Has anyone heard/used Sprint Booster to increase throttle response?

Guys, any ideas on engine mods to increase hp? Already installed an injen cai but want more increase. Besides exhaust and headers what else will give it more pep? Any performance chips out there that are reliable?

Im replacing my old clutch any ideas on a solid affordable stage 1 or 2 kit?

what would cause my car to hesitate when accelerating? it lags a lot when u hit gas hard...mass air flow, clutch?