Quote:
Originally Posted by ERZpower
Magnaflow use 409 Stainless, which is two grade lower compare to 304
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Yea, I suspected this as well. I had a magnaflow catback on my accord for about 6 years, and the piping is covered in surface rust. It does not yet appear to be structural, but over time it may become so. Maybe I should try a magnet test, as I think 409 is magnetic while 300 series is not.