OP, it really would be more cost effective to either swap in a Complete S54 motor, or simply sell your current 330 & buy a new used E46 M3 in good condition.
Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 S.C.C.A.
http://www.vimeo.com/8486878 (Dyno Video)
"Chance Favors The Prepared Mind" M54 CAMS 264/252 $849
Originally Posted by RacerX
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!