The best reason I can think of is that S motors are too easy to get. Why reinvent the wheel, the M54 is as much to tear down as a S54.. (Basics like gaskets ans such for a inspection refresh and compression ratio adjustment. )
I live a couple miles form Horsepower freaks, and I talked to a couple different guys there about my 330ix..
They both said the same thing,,, the M54 just does not handle the HP upgrades the M3 bottom end will...
I'm not sure I believe its that dire, the M54 may not make 1400 hp , but450 would rock...
Problem is their kit price is above and beyond my fun budget... LOL
Last edited by dwtaylorpdx; 01-05-2013 at 11:08 PM.