Hi . I have Sprintbooster i put on my E55 W210 Estate Its brand new and to be honest it was a bit to much in the AMG , just touch the throtle and it would pin my poor dog to the rear window , the AMG has a slightly diff Box ECU and adaption settings and was a bit of over kill . Should work well in the CLK though , if your interested send a private message , Regards Humbley