It just sucks to put all that R&D into a motor, build a great looking 4 door (which isn't easy to do), and then weigh it down with 4200lbs. You mean to tell me that a C63...which has a 6.3 litre V8...a way bigger engine than an RS4...and it weighs 3650lbs....but Audi can't??? Besides the 4WD i'd love to know where the weight goes.
Here is a great video on the big 3
YouTube - Top Gear M3 E92 vs. Mercedes AMG C63 vs. Audi RS4 (PART 1/3)