Mod for mod they are identical, but stock for stock my experience the '13 make around 390 ish rwhp m6 car and the '11-12 make 380 ish. There are a few "freak" '11-12 out there but majority of them are in the 380 range. Remember also that the early '12 had the "'11" engines and late model '12 had the "'13" engines with the revised head bolts missing oil squirters and updated programming. Hell we had an '11 come in that made 405 bone stock m6 car and we have seen m6 cars make a low as 360... The '13 are real consistent 385-390 bone stock..
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