CTS Turbo F90 M5/M5C & F91/92/93/ M8 High-Flow Cats are made to maximize exhaust flow for highest power gains. Do not compromise performance and sound with factory parts. \n \nDesigned using the latest in CAD technology; this part is made to fit perfectly in place of restrictive factory catalytic converter. Manufactured from CAST T304 stainless steel; hand TIG welded and back-purged to ensure years of reliable performance. \n \nIn addition to unleashing the power and performance of your 4.4 Twin Turbo, our High-Flow Cats will make your vehicle sound like it really should. When installed with factory exhaust it produces a louder and deeper growl with much more pronounced exhaust "crackle" on downshift. While up-shifting you will enjoy a confident "punch!" as you bang through all 8 gears. The sound will be even louder if you already have an aftermarket exhaust system. \n \nProduct Details: \n

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• 80mm or 3.15" diameter piping
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• Cat size: 110mm OD x 90mm Long or 4.33" OD x 3.54" Long
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• Includes 200 cell sport catalytic converter
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• Designed and tested on a real car in the real world
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• Cast T304 stainless steel, TIG welded back-purged construction
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• Replaces restrictive factory catalytic converter
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• Great power upgrade with uncompromising performance
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• Incredible sporty exhaust sound, subtle when cruising
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• No drone with factory exhaust
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\nFitment: \n

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• 2018-2021 F90 BMW M5 (Including Competition Models)
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• 2020-2023 F91/92/93 M8 Coupe, Convertible & Gran Coupe (Including Competition Models)
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\n  \n \nTo remove the CEL that will occur, proper stage 2 tuning software must be used.