My 335is dynoed at 319whp on a DynoJet with 93 octane against the 320BHP that BMW advertises it at. Saw the 1M dyno at 331whp against the 335BHP that BMW uses. So the 1M is stronger & in proportion to the advertised spread. It would be a bit more of a tune in the ECU because just about everything else is the same.
Main thing is both numbers are bogus because using the CHP/BHP scale they both are under-rated quite a bit.
Last edited by bear-avhistory; 02-22-2013 at 07:20 PM.