The HKS RX-8 Legamax catback exhaust system is designed to reduce backpressure and increase exhaust flow for greater peak power and a broader torque band. Each Legamax catback exhaust utilizes a specific muffler design and shape along with the appropriate piping diameter to maintain low-end torque while maximizing high-end horsepower. All HKS Legamax exhaust systems are made from polished SUS304 stainless steel piping. The RX8 exhaust has 65mm (2.55 in.) exhaust piping with twin 100mm (3.94 in.) tips. Finally, an exhaust worth getting a mortgage for!