After doing some searching and browsing for my answer I still have not found anything. Question is, I notice dark almost black residue on the rear fender when I bought my 05 with 108k miles. Most of it was cleaned off when I had it all detailed in and out. But I recently put a wicked flow muffler on and used the stock piping and it still has this dark build up on the exhaust tip? Almost looks like a diesel sometimes! lol
Id imagine its some kind of carbon build up or maybe im running rich? I replaced the stock air filter and used carbon cleaner on the maf and throttle bottle at 108k miles.
Is this somewhat normal or maybe something to look into? Any feedback or suggestions would be much appreciated! Thanks in advice.