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Nothing to noticeable, maybe 6-7 hp if tuned right. If you go too lean you could risk detonation. I know someone on here stated their gas mileage went up after they tuned their AFC to lean out the cruising rpms. IMO, it's not worth the money if you're running a stock car.
if it can raise the rev points, idk anything about these things, then supposedly u can get more HP out of it...i think? i remember there was a vid of a 92sc4 and they raised the rev limiter and it made reasonable numbers with intake and exhaust...