Audi RSQ8 / SQ8 / SQ7 – EPA-Compliant 400 Cell Catted Downpipes

Unlock the Full Potential of the 4.0T Twin-Turbo V8 • High-Flow • Compliant •

Introducing Our NEW 400 Cell EPA-Compliant Downpipes for Audi 4.0T

The 4.0T twin-turbo V8 powering the Audi RSQ8, SQ8, and SQ7 delivers immense performance — but factory catalyst restrictions hold it back. Our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to increase exhaust flow, enhance turbo efficiency, and dramatically sharpen the vehicle’s sound profile — all while maintaining emissions compliance standards.

This is the foundation of true 4.0T performance.

Why Upgrade to 400 Cell?

• EPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust velocity while maintaining compliance standards.
• Faster Turbo Spool: Reduced backpressure improves throttle response and mid-range torque delivery.
• Sharper Exhaust Note: Enhanced turbo acoustics with deeper low-end presence and more aggressive top-end tone.
• Optimized Performance Balance: Noticeable gains without compromising daily drivability.

Performance & Engineering

• Optimized Flow Architecture: Designed to reduce restriction while preserving catalyst efficiency.
• Mandrel-Bent Tubing: Smooth internal transitions for maximum airflow.
• Precision TIG Welding: Built to withstand extreme exhaust temperatures and boost pressures.
• Direct OEM Bolt-On Design: Utilizes factory mounting locations for straightforward installation.
• Engineered to Pair Seamlessly with Valvetronic Titanium Exhaust Systems

Sound Transformation

• Stock Exhaust + Downpipes: Noticeably louder with stronger turbo character and deeper exhaust tone.
• Valvetronic Exhaust + Downpipes: Maximum transformation — sharper transitions, increased aggression, and a true RS-inspired exhaust 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 boost

Unleash the true sound and performance of your Audi 4.0T — starting at the source.

📩 Questions or ordering assistance? customerservice@valvetronic.com

Orders are processed same or next business day. Shipping times vary depending on the product, shipping service, and whether freight shipping is required. While we ensure all inventory levels are current and accurate, they can change due to logistics and inventory feeds. Standard shipping typically takes 3-7 business days, but some items may require additional time depending on their origin. Feel free to call us anytime for the latest status of your order.