Track Day Muffler - TitaniumSpecially developed for use on racetracks where lower noise levels are required. Optional headers available for some models to improve torque and power, especially from the mid range upwards. PART #1811 4052 must be combined with either PART #1812 0325 link pipe for mounting on stock headers or PART #1812 0324 link pipe for mounting on the header set from the PART #1810 2344 Evolution Line kit. Evolution line PART #1810 2344 or Racing Line PART #1810