I have a 2009 JCW and got RENNTech in Florida to tune my ECU. It is absolutely fantastic. Lenny, the tuner, called me from Florida to discuss my car, any mods, and expectations. The tune increased my engine output by about 40 HP. Several months later, I still grin from ear to ear when I drive my baby. I whole heartedly would recommend RENNTech. I believe they also have a tune for an R56 S.