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Picked up a new 3" exhaust last week, aluminised mild steel, nothing fancy just wanted to replace the factory exhaust because it's pretty beat.
Inside the new exhaust pipes there's some surface rust along a seam running the length of the pipes. I'm wondering if this is normal or a sign of a defective product? I've attached some pics and would appreciate advice. It's the first exhaust I've bought so not sure if this is to be expected.
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