ACAT HB™ is proudly manufactured in the USA. Distinctive in the marketplace, HB™ refers to the HerringBone pattern, which is integral to every ACAT HB™ metallic substrate catalytic converter. Our performance catalytic converters utilize a unique construction that facilitates the seamless intermixing and flow of exhaust gases throughout the substrate, in contrast to conventional ceramic core converters that rely on single-channel cell patterns. The HB™ design promotes turbulent exhaust flow, effectively disrupting the boundary layer effect typical of other catalytic converters. Tailored for the exhaust gas velocities of modern engine designs, the ACAT HB™ solution offers a plug-and-play advantage, enhancing airflow for increased power and reducing restrictions to improve fuel efficiency under normal driving conditions. ACAT Global Catalytic Converter Systems are produced in the USA and Canada, and they come with a limited lifetime warranty.