HJS Cat Silencer System up to 2.000ccm 70mm 143x580mm HJS Cat silencer system 90 95 0670 Cat silencer system up to 2.000ccm 70mm 143x580mm Diameter: 143mm Length: 580mm Pipe connection dimension: 70mm FIA Homologation: Up to 2.000ccm / up to 4.000ccm* (2 cats parallel) The integrated catalyst silencer system developed by HJS offers many advantages. The compact design allows installation even on vehicles with little ground clearance. The combination of silencer and catalytic converter ensures a significant weight reduction. The catalytic converter, which can be replaced as a component, guarantees a cost-effective replacement.