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The Mperformance exhaust was designed with the OEM cats in mind. The tuning of this exhaust is based on a OEM midpipe. Its a very aggressive cat back kit tuned for the OEM cats. Remove the cats and it becomes obnoxious..
Dave
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2020 Ford Mustang GT 6MT PP1 444rwhp
(Sold)2013 M3 Coupe-MR/BLK ZCP, 2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk
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