So you want your M42 to go M3 faster.........how about turning your M42 into a 2.1 stroker turbo!
What you need is a BMW M47 diesel crank, con rods and race pistons.....oh and a turbo ....... OVER 200bhp and a lot lot more torque!
Check out what these guys are up to .....:
http://www.m42club.com/forums/showthread.php?t=254





