from what i have read, seems like pcv with auto tune is the way to go for adding up grades slowly, pcv first, air intake, exhaust, and cams over winter keeping all else stock on 2012 cc. has flip wind shield installed before bought it and bad turbulance issues. Seems lowers for razor crash bar first then address the height of wind shield. any comments are apperciated on any above. will keep reading all posts to keep up.