These sport cats feature German made HJS 200 cell EURO 6 EC certified compliant tri-metallic catalytic converters. We use enlarged piping from the engine side to the cat, and from the cat to the rest of the exhaust. These are the largest and highest flowing catalytic converters you can fit on the 2020+ Corvette C8. 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. Our Sport Cats are a direct bolt-on replacement for the factory C8 catalytic converters.