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The FABSPEED downpipes feature German made HJS 200 cell EURO 6 EC certified compliant trimetallic catalytic converters. They use 4 in piping from the engine side to the cat, and 3 in tubing from the cat to the rest of the exhaust. They are the largest and highest flowing catalytic converters you can fit on the 2020+ Supra. Larger catalytic converters are better because they allow for more exhaust flow and the increased catalysts surface area allows for better exhaust gas filtering which means emissions compliance and will NOT trigger a check engine light. FABSPEED Sport Cat Downpipes are a direct bolt-on replacement for the factory Supra catalytic converter.