I’ve had an after market on mine for a couple of years. It triggers the EML but makes zero difference to the car’s performance.
Come MOT time I get it turned out, get the MOT done, and move on.
THe cat was £250 from Catman UK and whilst smaller than the OEM ones, hasn’t given me any problems.
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2002 S8 Aqua Pearl, entirely original apart from FE 20" OEM wheels and Milltek exhaust.
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