OBX Performance Turbo Back Exhaust 05-08 Audi A4 Quattro B7 2.0T Non-Resonated Premium SUS-304 stainless steel for durability Value Added Direct Bolt on/ Weld on Set up with Nut, Bolt Accessories Included Precision Computer CNC machined flanges with DUAL-TIG welded construction Backed by Limited Lifetime Warranty from Manufacturer Defects OBX Genuine Products Design and Quality of OBX U.S.A.