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Heat certainly causes rust, and there's a lot of moisture that comes out a tailpipe too. My farmer friends seem to know exactly what it takes to make a truck last, and they keep their tailpipes a few inches below the body to keep the heat from rusting their bedsides.
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Man they must import all those rust free truck in AZ from Wisconsin then. /forums/images/graemlins/rotfl.gif
I dont buy it. Rust forms when the paint that protects it fails. Now the heat burning the paint off I could buy but the pipe would have to be pointed directly at the pannel. It hasn't rotted the sides of my 75 that has rattle can paint on them and I regularly have to bend the pipes back down. It hasn't melted the plastic bumpers off my old supra in 13 years or my wifes plastic bumpered Honda. If the heat was enough to cause the rust it sure would melt them plastic bumpers off. Keep the paint waxed and fix the chips and it won't rust.