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Thanks! I may be wrong but I don't believe the stainless is coated in any way out of the box. The surface rust/corrosion properties will still be the same polished or not since it is 409 stainless, but it shouldn't rust on the surface for a long time. I average 500-600 miles per month and we don't have anything on the road to speed up the surface rust. I had a 4th gen Z28 with a Magnaflow catback (also 409 stainless) installed for about 25k miles and it looked great up until the point I took it off.
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