Okay...first post to this board, so here goes... I'm expecting to take delivery of my CS sometime in April. I was able to spend a little bit of time in one during a test drive, and I'm pretty happy with the car in its stock form...however...I would like to do something with the intake/exhaust on the car to allow it to breathe a bit more freely, and get additional sound (for my own personal taste, it seemed a bit too subdued when in the car...even after the by-pass opened). I've read through all CS related posts, finding mention of a Challenge type air intake, the Tubi GT exhaust system, etc., but I haven't really see any definitive answers as to how these changes have been received, and if they would be recommended. There was also mention of a Stebro 360 competition system which looks to do away with the muffler can completely. I was considering doing the air intake, adding a Stebro "type" competition system to do away with the muffler and the by-pass valves (don't know if such a system is currently available for the CS), and trying to find some higher flow cat's. The other side of this is that I don't want to have any issues with the check engine light, and I don't want to go the route of O2 simulators. I was wondering if what I'm looking to do sounds feasible? Any advice or part recommendations is definitely welcomed and appreciated.