OBX Performance Exhaust Header 06-08 Mazda MIATA MX-5 Roadster MZR I4 2.0L Precision CNC machined flanges with TIG and MIG welded construction Utilizes factory 02 sensor positionDyno Proven,Dyno Tested Track Proven to Increase Low End Torque And Horse Power Value Added Direct Bolt On Set Up with Header gaskets included as shown Mandrel bend for ultra fast and smooth flow Backed by Limited Lifetime warranty from manufacturer defects