Hey guys, while getting on to the interstate today i punched on the throttle to beat a car that wouldnt let me in....noticed that my exhaust was not solid black like it normally is when i hammer on it, but had more of a gray tint to it. Is this indicating a problem?? No error messages, truck runs good, it is time for me to change the oil but other than that truck is running like it always has. My truck is a 2015 de-leeted using SCT X4 with PIP V-7 tunes running it on the Performance tune, 38,000 miles on it....any tips or help is greatly appreciated! Thanks