Optional titanium link pipe for mounting with the header set from the S-Y10E3-APT Evolution Line kit, Evolution Line S-Y10E3-APT or Racing Line S-Y10R15-APLT (the collector and headers with associated fitting material (flanges, springs, inner sleeves and lambda plugs - please refer to schematics of the mentioned systems).Static noise level for Evolution/Racing Line headers + Evo Kit Track Day link pipe + Track Day Muffler is 97,5 dB @ 5500 rpm. For perfect performance, throttle response and durability, ECU remapping is recommended.THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.