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my advice is, talk to sam at by design here. he'll know what can/can't be done with stock k24's.
Although I have a K16 car, I agree with this advice, talk to Sam. He's worked wonders with my car, which is stock except Kline exhaust, 100 octane, and his custom Cobb tune. No lag here, although clearly not apples to apples.
I'm in NorCal and am available for joyrides as well