my truck has DTLT headers, URD y-pipe, and URD 3" catback, therefore i have no catylitic converters. since i have to cats, i am constantly getting a buildup of carbon (i think?) on the side of my truck.
this picture was taken immediately after i washed my truck and i sat there and scrubbed at it and couldnt get it off. does anybody have any ideas to remove it that wont damage my paint?