rmv90718 OBX Performance Shorty Exhaust Header 02-07 GM 4.8L 5.3L 6.0L Precise CNC machined flanges with TIG and MIG welded construction Dyno tested and proven increase horse power High quality 304 grade stainless steel durability Dual Tungsten Inert Gas (T.I.G.) welding for stronger hold Lifetime warranty from manufacturer defects