My tailpipes are black on my 2012 GT with BAMA 93 Race Tune. Have 3" Heartthrob CB with Rousch mufflers, Airaid CAI w/ insert removed. I can't even get the tips completely clean. Had this same exhaust on my 2011 GT also runing 93 Race Tune. Mufflers were never black like this on other car in 8000mi. Only been runing Race tune in 2012 for about 400mi. Way too rich! Anyone else have this problem?