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i asked the same question before i got my stainless.
http://www.fordraptorforum.com/f160/aluminized-vs-stainless-mbrp-24264/
pics of new and after a little over 6 months. some rusting. ill probably put something different on before it rusts out anyways, but i do love the sound.
Are you sure that's rust and not just debris that has stuck to the muffler and melted to it from the heat?
could be i guess. not sure. how the hell do i tell the difference?
I got the stainless steel MBRP turndown and its great. If you're worried about surface rust you could always coat it with the high temp paint. I thought about doing that but I decided against it because it's under the truck, no one sees it so who cares.
I bought my turndown mbrp from one of our vendors gotexhaust.com . They gave me a heck of a deal for the stainless turndown, just figured I would throw that out there. Customer service was also good as well.
I got the stainless steel MBRP turndown and its great. If you're worried about surface rust you could always coat it with the high temp paint. I thought about doing that but I decided against it because it's under the truck, no one sees it so who cares.