Non-RS owner here (2012 LT Turbo 6-speed, one of the first. Couldn't wait long enough for the RS. 45k miles). My comments mirror Jake's below (above?) about it. I've got Eibach lowering springs, intake, exhaust, shifter bushings, and the same Trifecta tune. I'd say the tune is suuuper worth it as it completely changes… » 3/02/15 7:10pm Monday 7:10pm