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.
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