First off thank you bigblock427 for all you insight on the subject! You're dead on. Cams would really wake this engine up... The only upgrade I've done so far is the 74mm TB upgrade.

Yes, if anyone here is going to do any MB engine swap make sure it's '04 or up!! There were huge material upgrades starting in '01. The 04-05 ML 350 and 06 S 350 are the 3.7L M112 ENGINES NOT THE 3.5L M272 ENGINE.

All accessories swap over... I swapped everything that I could. No one would know that this car has a 3.7L in it unless they ran the engine code!