Valvetronic Designs Audi C8 RS6 / RS7 400 Cell Catted Downpipes

The Audi C8 RS6 and RS7 combine executive refinement with supercar-level performance, powered by the formidable 4.0T twin-turbo V8. While factory catalysts restrict exhaust flow and mute the engine’s full character, our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to reduce backpressure, enhance turbo efficiency, and unlock a deeper, more commanding exhaust tone — all while maintaining emissions compliance standards.

This upgrade forms the foundation of serious 4.0T performance.

Why Upgrade to 400 Cell?

• EPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust efficiency while maintaining compliance standards.
• Improved Turbo Spool & Mid-Range Response: Reduced restriction sharpens throttle input and power delivery.
• Enhanced Exhaust Character: Deeper tone with stronger turbo acoustics and more pronounced high-RPM presence.
• Street & Performance Balanced: Noticeable gains without compromising daily refinement.

Performance & Engineering

• Optimized Flow Architecture: Minimizes backpressure while preserving catalyst efficiency.
• Mandrel-Bent Tubing: Smooth internal transitions for maximum exhaust velocity.
• Precision TIG Welding: Built to endure sustained high exhaust temperatures and boost levels.
• Direct OEM Bolt-On Installation: Utilizes factory mounting locations for straightforward installation.
• Engineered to Pair Seamlessly with Valvetronic Exhaust Systems

Sound Transformation

• Stock Exhaust + Downpipes: Noticeable increase in depth and turbo presence with enhanced exhaust clarity.
• Valvetronic Exhaust + Downpipes: Maximum transformation — stronger presence, sharper transitions, and a true Audi Sport-inspired signature.

Construction & Durability

• Premium high-grade stainless steel construction
• High-temperature resistant 400 cell catalyst cores
• OEM-style sensor placement for proper operation
• Engineered for long-term reliability under high-performance conditions