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depends on the set-up,... now when you rip all the factory stuff out and replace it with a AFM NA Power Pipe 80MM pro-m mass air and the ever so popular K&N filter that's when it makes a difference. LOL
Yes, I would prolly agree to that.. But I haven't seen any data on it although there prolly is some somewhere.
I know my mac cai didn't do SQUAT one at the track or on the road. A slight difference when it was cold out ..like 2.3 rwhp ..maybe. For $90 it was a waste.