Audi S4 S5 B8 B8.5 Stainless Steel & Titanium Valved Cat Back Exhaust Audi S4 5 (B8) Valved Exhaust + MidPipes (CES3) Valvetronic Designs Valved Sport Exhaust System for B8 & B8.5 Audi S4 Milltek Valved & Resonated Catback Exhaust System for B8.5 Audi S4 S5 ECS News New ECS Downpipes & Valved Exhaust System B8 8.5 S4 S5 ECS News New ECS Downpipes & Valved Exhaust System B8 8.5 S4 S5. Demand the Best. Demand Capristo. Capristo Exhaust Systems are engineered and manufactured exclusively at our factory in Sundern, Germany, utilizing advanced 3D laser scanning, CAD design, digital prototyping, and CNC bending milling. Technical Highlights: 100% Made in Sundern, Germany Highest Grade T309 (1. 4828) Stainless Steel; similar resonance properties to Inconel, notably used in F1 Proprietary Valves Manufactured by Capristo Patented Reinforced Design to Eliminate Resonance Manually TIG Welded by Capristo Craftsmen Hand Polished to a Mirror Finish Post Weld Proprietary Module to Handle Valve Control Utilizes OEM Exhaust Finishing Tips for Stealth Look Optional Capristo Exhaust Tips are Available CES3 EVCU1 Installation User Manual Installation Guide