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Even if you hammer in the heat shield they still hang a tad low and will rub on bad speed bumps and such. I loved the way they sound. The only advantage of going with a Fabspeed setup is with the 02 extenders you can probably get by without a tune. I would prefer to have the cats in the secondary position as I feel there is less turbulence after the header that way. If you want to get a tune down the line I would pass on the Fabspeed and go with a testpipe setup or go with the cats in the secondary position.
Just my .02
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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