I have a can of Never Dull. I use it to get the burnt fuel off the exhaust tips. It makes them nice and shiny w/o any scratches. I've had this can for 10 years and barely use it because it lasts so long.
My K&N polished intake tube was perfect....I use Mother's Billet Polish on it and it works like a charm! (BTW I clearcoated my CF heat sheild and it looks awesome, if you have the CF one that is...)
It works great on non-clearcoated aluminium and SS. If the aluminum is very dull but smooth, get some 0000 steel wool. You should be able to polish is fairly easily.
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