no way that engine is making 280 rwhp with stock heads and intake. is it a cobra intake? ported heads? diff cam?
like you said alot of cars are making 270-300 with alot of aftermarket parts and you doing it with stock parts?? there more to that engine than you know or are telling most stock 5.0s dyno around 180-190 rwhp. with a cobra intake, bigger mass air, 65 mm t.b and flowmaster exhaust i dyno'd 235 rwhp.
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