up and running without any issues
"I had my mechanic swap in the Valvetronics downpipes to my 2025 RS7. Break-in was straighforward and no CEL. Definitely changed the sound and performance immediately. Highly recommended-"
Audi C8 RS6 / RS7 400 Cell Catted Downpipes
Sale price
$2,549.99
Regular price
$2,999.99
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SKU:
AUD.C8.RS6.FF.400C.BR
In stock
Audi C8 RS6 / RS7 400 Cell Catted Downpipes
Free Shipping to the 48 Contiguous States
Sale price
$2,549.99
Regular price
$2,999.99
Audi C8 RS6 / RS7 – EPA-Compliant 400 Cell Catted Downpipes
Engineered for the 4.0T Twin-Turbo V8 • High-Flow • Compliant •
Introducing Our NEW 400 Cell EPA-Compliant Downpipes for C8 RS6 / RS7
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
Unleash the full potential of your C8 RS6 or RS7 — starting at the source.
📩 Questions or ordering assistance? customerservice@valvetronic.com
T304 Stainless Steel Construction: Resists corrosion and heat cycling for a system that outlasts the car, High-Flow Catalyst: Far less restriction than the OEM unit while keeping emissions equipment and odor in check
- Brushed T304 Stainless Steel
- T304 stainless steel for long-term durability and corrosion resistance
- Fully mandrel-bent tubing for maximum flow and sharper throttle response
- Non-Valved Design – pure, uncompromised sound at all times
- Direct fit for Audi RS6
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Warranty Coverage
All products manufactured by Valvetronic Designs are guaranteed to be free from manufacturing defects in materials and workmanship at the time of sale. A manufacturing defect is defined as any characteristic of the product that arises during the manufacturing process which impairs its usability for the purposes for which it was designed and manufactured.
Products are guaranteed to fit and function as designed on their intended vehicle application, provided the vehicle has not been modified or incurred structural damage. Sound or tone is not a warrantable or returnable issue, as exhaust sound is subjective and not considered a defect.
Warranty Periods
- 304 stainless steel and titanium exhaust tubes and welds carry a Lifetime of Ownership limited warranty against defects in workmanship or material, including penetrating rust.
- Mufflers and resonators carry a 3-year limited warranty against defects in workmanship or material, including penetrating rust.
- Catalysts are warranted to conform to EPA emission testing and OBDII compatibility criteria for 25,000 miles from the date of installation, whichever occurs first.
- Catalytic converter external shells, including end pipes, are warranted against corrosion and defective welding for 5 years or 50,000 miles from the date of installation, whichever occurs first.
- Vacuum pots, electronic remotes, and mechanical valves are covered by a 1-year limited warranty.
- Electronics, including 12V vacuum pumps, RF modules, and controllers, are covered by a 1-year limited warranty.
- Tip finish is covered by a 1-year limited warranty.
Warranty Terms
- Warranty coverage begins on the purchase date and applies only to the original purchaser.
- This warranty is not transferable or assignable at any time.
- Discoloration caused by heat, salt, brine, or other road treatments is not covered.
- Tip finish discoloration or damage caused by heat, chemicals, lack of maintenance, road salt, brine, other road treatments, road debris, or misuse is not covered.
Pair of 400 cell EPA compliant catted downpipes, and all necessary clamps and hardware
Overall rating: 5.0 / 5 from 1 reviews.
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