Optional stainless steel link pipe with resonator for mounting with the muffler and header set from the Evolution Line S-H10E3-APLT or Racing Line S-H10R9-APLT. It lowers the noise levels for use on racetracks where lower noise levels are required.Static noise level with noise insert: 97,1 dB@5500 rpmStatic noise level without noise insert: 100, 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.