[502 MotorSports]

Fitted with a modified M5 V10 engine, a 7-speed SMG gear box and the HARTGE modification to raise maximum speed from the electronically limited 250 km/h to 320 km/h, the H50 V10 puts all its power - 550 bhp and torque of 520 Nm (384 lb-ft) .........
http://www.germancarfans.com/tuners.cfm/tunerid/7051123.001
http://www.e90post.com/forums/showthread.php?t=8154

 

[502 MotorSports]

not enough?

Here is a 700hp V12 x5 w/ 7spd manual
http://videos.streetfire.net/Player.aspx?fileid=51F08AD2-A549-43F0-AD1B-E91F288808EB&p=0