I have a 98 c240 Sport estate which I love, but is rather lacking in the 'go' department. Consequently, I have been looking at the low price of similar aged rusty E55 saloons and am thinking of using one as an engine donor. Although I have a fair amount of experience with fabrication and engine swaps in old cars ( Rover V8/ Ford Pinto & Cosworth/ Ford & Chevrolet small-block V8s into various cars ), I have no experience with anything relatively 'modern'. So the question is; besides the engine, gearbox ECU/ Loom and the EIS, what other mysterious black boxes will I need to liberate from the donor car? Thank you in advance, and apologies to the moderators if this is not the appropriate forum.