CTS Turbo B9 S4/S5 3.0T (EA839) high flow cat is made to maximize exhaust flow for highest power gains. Do not compromise performance and sound with factory parts - unleash your B9 S4/S5 3.0T potential! \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 3.0T, the CTS B9 S4/S5 3.0T EA839 high flow cat will make your vehicle sound like an S-car really should. When installed with factory exhaust it produces a sporty growl with much more pronounced exhaust "crackle" on downshift. While up-shifting you will enjoy a confident "braappp!" 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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• Designed and tested on a real car in the real world
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• 200 cell steel high-flow race cat
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• Cast stainless steel body
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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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• Install hardware included (gaskets not included)
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\nFitment: \n

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• 2018+ Audi S4 3.oT (EA839)
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• 2018+ Audi S5 3.oT (EA839)
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\nTo remove the CEL that will occur, proper tuning software must be used.