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It wont rust, but mine tarnished very bad from heat. It almost black. If you get stainless be sure and get double wall. Also I tow a lot and have the 6.2L gas engine.
While I can't say for certain, I highly, highly doubt it. It's an oem tip. Maybe someone who has the oem tip can look in there and tell us. I think it just fits pretty snug around the tailpipe.
I had planned on buying this tip at one time. But while I was storing my muffler tailpipe assembly when running the muffler delete, I ran up on the tip of my tailpipe with the lawn mower in the garage. So it's a little oval now. Going to cut it and run the second one I posted.