OBX Performance Exhaust Manifold Header 85-91 Chevy Corvette C4 L98 5.7L w Y-Pipe High quality T-304 stainless steel Lifetime warranty from manufacturer defects OBX Genuine Products Design and Quality of OBX U.S.A Value Added Gaskets & Hardware included as shown Precision CNC machined flanges with DUAL-TIG welded construction