10% sounds like it s/b correct if it's at the crank... I have a "stock" S2 with MOPAR cat-back... I've hit 333 hp during a third gear pull. 10% of that is 303 hp, and take 15% of that for the FWD WHP percentage.. so that's 255.85 at the wheels.. which is somewhat around the MOPAR S2 rating of 265.. also my fuel mileage on the gauge is about 10% low. Gotta set the adjustment to 90 on the guage one I get it reflashed.
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