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If you have had such bad luck with sports cats in the past, suggest you consider using aftermarket upgrades that feature the likes of HJS in Germany, who make oem hi-flo products for AMG, Alpina, RUF etc etc etc.
The cat v decat debate will always rumble on regardless........
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Fettled M135i EB AT then AW M2 DCT - both gone but not forgotten:
Current '22 X3M LCI..
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