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 SCCA
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"
I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & Xi E46's
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
Originally Posted by RacerX
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!