Howdy, Just washed my car 3 weeks (yes, bad I know) and about 1500ks after getting my full exhaust, OTR and tune, and noticed absolutely no carbon on the tips at all. Their is no white stuff on them either, which I've read can indicate the car is running lean, no codes are being thrown either. Possibly worth noting, I think I've developed an exhaust leak, as their is a strange ticking/pattering noise coming predominantely from the drivers side nearish to the flange where there headers meet the cat pipe (again, no carbon). Video below: Possible exhaust leak? http://vid1369.photobucket.com/albums/ag231/Christov_Radevic/Video 1_zpsmxtcgsd4.mp4 Let me know your thoughts, am taking car to shop that did the work tomorrow for them to check out, but would like some input prior to. Cheers!