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How would you go about repairing this rust?
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Ahhh, is that under the heat shield for the cat? Been there! Mine had rusted through and needed to cut out pieces of the floor and weld new pieces in.
First question, is it through yet or surface? You will need to remove the heat shield and see how bad.
What I ended up doing after the repair, I installed stainless bolts through the floor, double nut the under side, fender washer, heat shield, fender washer and nut. My theory is leaving an air gap between the heat shield and body.
I used POR15 on both sides and seam sealer on the seams.2004 525i Manual - 1985 325E Coupe Manual
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