2013 Ford Focus ST3
I recently purchased a 13' ST with roughly 83,000 miles and now have roughly 86,000 miles. I have a straight pipe from cat-back with a stock downpipe and experience an abnormal amount of soot on my hatch and bumper after each drive. I knew this would happen and have accepted it but would cleaning my intake valves help at all? I realized the intake valves have probably not been cleaned so they are most likely filthy.