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......... Which did you use as a donner engine? The ML or the S? I understand there are some differences in the front of these engines which affect how easy it is to mount up the accessories, etc. Thanks