OBX Header 94-97 Mazda Miata 1.8L 4-2-1 (1pc.) Precision Cut CNC machined flanges with TIG and MIG welded construction Utilizes factory 02 sensor position Dyno Tested Track Proven System To Increase Torque And Horse Power Value Added Direct Bolt On/Weld-On Set Up Installation no drilling and no cutting. Easy professional-like installation and convenience Backed by Limited Lifetime warranty from manufacturer defects