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Can the factory exhaust pipe be polished on the NNBS? I think it is stainless, but I don't wanna go sanding and polishing and remove any coating that may be on it. The 6.2 has the 3 1/2" pipe out the back and it is starting to look grimy already.
 

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Just use an sos pad makes it look brand new.
 

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I used to use 0000 steel wool and some aluminum polish and it made it look brand new for a week or so.
 
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