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stick147 you must be buyin junk cai's every truck I have ever put one on has had improved throttle response. On my 2000 silverado I had K&N kit and stock exhaust on the 4.8L V8 and it improved throttle response even on a 1994 silverado with 4.3L V6 and just replacing the filter only to a K&N filter worked. On my 05 dakota with an airaid intake kit it improved throttle response. Not as much as replacing the clutch fan with an electric one but still noticible. The best mod for more throttle response electric fan.