So you’ve grown up owning fast cars. Mustang’s, Corvette’s and even the odd import. However now that you’re an adult you feel that you need something that’s well… more adult-like. Enter the RennTech CLS63 AMG, an already fast car that’s been tuned to be wickedly quick. Matt Farah recently headed down to South Florida where he not only sampled, but kicked-the-ever-lovin’-crap out of RennTech’s newest street machine.