Just heat tempering and exhaust soot, autosol and a catch can should sort that, my exhaust tips stay super clean now I run a catch can venting to atmosphere, nothing wrong with the stainless, looks nice :)
 
Dp and Decat will allow more soot out if any but to me that just looks like heat colouring it'll polish straight out, my exhaust went brown after a few laps round the ring it just heat related I run a Dp and Decat also.
 
That would annoy the hell out of me, so pleased my miltek doesn't do that. First time I've heard of that ever happening. Very strange!


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