I was able to find some low mileage stock headers/cats, where someone had went cat-less headers. I bought the 40,000 miles cats for my E46 M3 for $400.
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2011 BMW Z4 35i 6sp wh/rd
2017 BMW M4 Comp DCT blk/blk
2001 Porsche 911 Turbo 6sp blk/blk
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