OBX Performance Catback Exhaust System 97-01 AUDI A4 B5 QUATTRO 2.8L V6 30v Avant Premium quality T-304 stainless steel Backed by OBX Limited Lifetime warranty from manufacturer defects Value Added Direct Bolt On Set Up Without Any Modification with Accessories Included As Shown Precision CNC machined with DUAL-TIG welded construction for added strength OBX Genuine Products Design and Quality of OBX U.S.A