⭕ I purchased the cat back slip on system with the titanium tips and installed in 2013, I then added the rest of the exhaust system IN FULL (along with an AFE stage 2 air intake in 2014 which is also for sale) . The equipment was used for approximately 900 miles, THATS IT. I have since sold the BMW to add on to other collections. The entire system is as near new as you can find. The car was never raced nor driven in inclimate weather. the boost in performance is incredible and the sound is even better. By far the absolute best system i had ever purchased.