Optional stainless steel link pipe with resonator for mounting with the muffler and header set from the Evolution Line S-K10E10-RC or Racing Line S-K10R10-RC. It lowers the noise levels for use on racetracks where lower noise levels are required.Static noise level with Track Day link pipe: 97,4 dB@5500 rpmStatic noise level with Track Day link pipe and optional noise dumper: 95 dB@5500 rpmFor perfect performance, throttle response and durability, ECU remapping is recommended.THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.