M177/W213 E63S High-Flow Catalytic Converters

The CTS Turbo Mercedes-Benz M177/W213 E63S High-Flow CATS are engineered to significantly increase exhaust flow, leading to maximum power gains for your vehicle. Designed with the latest CAD technology, these high-flow catalytic converters are made to seamlessly replace the restrictive factory catalytic converters, ensuring a perfect fit. Constructed from durable cast T304 stainless steel, these downpipes are hand TIG welded and back-purged to guarantee years of reliable performance. The 70mm/2.75" stainless steel piping and quality construction contribute to both performance and longevity, fitting within OEM heat shields for a clean installation. Beyond performance, these high-flow cats enhance the exhaust sound, providing a louder, deeper growl with more pronounced "crackle" on downshifts and a confident "punch" during upshifts. The sound becomes even more pronounced when paired with an aftermarket exhaust system. Fitment is specific to the 2017-2023 Mercedes-Benz E63S AMG (W213) with the M177 engine and the 2017-2020 Mercedes-Benz AMG GT 63/63S (X290) with the M177 engine. Please note that to avoid a Check Engine Light (CEL) that will occur after installation, proper stage 2 tuning software must be used.