With 100% stainless steel construction and straight through muffler design, the Racing Spec II exhaust system offers both lightweight construction and extreme exhaust high-flow efficiency. Using spring hook type connectors along with an engineered intermediate silencer enhances torque at low RPM's. 0.8mm Super Light Weight, Spec II is a specially designed system for competition use only. Its simple straight thru design creates an increase of exhaust gas velocity in order to improve efficiency. The middle silencer (resonator) on the main pipe is designed to maintain torque in the low to mid speed range.