BMW 1 Series M Coupé, X5M and X6M Forum
X5M has an ESS tune, perhaps good for 30-40 crank hp. Otherwise it is stock.
The Mustang is stock. I believe they make 444 crank hp in stock trim.
2013 Ford Mustang Boss 302 Laguna Seca vs 2011 BMW X5M - YouTube
2013 Ford Mustang Boss 302 Laguna Seca vs 2011 BMW X5M - Ford misses third...