Racing Beat has worked hard to develop the "Cutting Edge" in Miata exhaust components, utilizing both chassis dynamometer and actual road testing. Our steel header incorporates a tuned "four-pipe into two-pipe into one-pipe" (Tri-Y) system to optimize exhaust gas scavenging characteristics and power output, while both improving the exhaust note significantly and retaining the factory catalytic converter. Engineered as a bolt-on installation, the header utilizes 14-gauge tubing throughout with thick, flame-cut flanges for positive gas sealing.