At the wheel Insideline saw 331 hp & 362 lb-tq. Those are huge numbers considering they ‘re taken at the wheel. For example Insideline did the same test on a N54 135i a few years back and got 285hp and 291lb-tq restively (which you can see here) . You can see the full graph after the break.



You can check out the entire story and the exhaustive testing procedures over at Insideline.