ive driven past cls63s and i had a cls for 3 years. just sold her last week. they get up and go and unless you plan to track/haul ass all day everyday the comfort level of the new cls is incredible. i test drove one on my last service and i couldnt beleive how fasssst the new cls550 is. twin turbo v8. if you are going balls out and getn the cls63 i wouldnt wanna mess with you on the streets. dont get me wrong i love my e92 but damn i miss the cls already and if pockets were extra fully right now ide drive to santa monica and get me a new cls. good luck with ur choice both cars are amazing in own ways.
whipple blown lightning
2010 f350 monster toy hauler.