Anyone know what the major differences are between the E55 and the newer E63 beside the obvious engine. From what I know the suspension, brakes, and I think steering (ratio) is different. I know the updated exterior is pretty much all swappable, I have the E63 front end on my 03 E55. My interest is with the performance aspect. Whats swappable or seems to be. Or better yet starting from 03 on to now what bits and pieces are the best parts form certain years. I've heard starting 05 the E55 started having stronger rear differentials? Heat Exchangers are different on different years also.