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Description

Valvetronic Designs 400 Cell Catted Downpipes for C8 Audi RS6 & RS7

Valvetronic Designs’ 400 Cell Catted Downpipes for C8 Audi RS6 & RS7 go to work at the source, directly behind the turbochargers where the 4.0T twin-turbo V8 makes its power and finds its voice. Built around EPA-compliant 400 cell high-flow cores, they cut backpressure without stepping outside emissions compliance standards, giving the RS6 and RS7 a deeper, more purposeful tone and a noticeably sharper mid-range. This is the foundation layer of a serious 4.0T build.

Design and Performance

Reducing restriction immediately behind the turbochargers is the most effective single change available to the 4.0T platform. The optimized flow architecture minimizes backpressure while preserving catalyst efficiency, which sharpens throttle input, improves spool, and strengthens mid-range delivery. Paired with a Valvetronic Designs valved exhaust system the change is at its fullest, with stronger presence, cleaner transitions, and an Audi Sport inspired signature high in the rev range.

Construction

Each downpipe is formed from premium high-grade stainless steel with mandrel-bent tubing for smooth internal transitions and maximum exhaust velocity. Precision TIG welds are built to endure sustained exhaust temperatures and boost pressure, while high-temperature 400 cell catalyst cores and OEM-style sensor placement keep the system operating correctly over the long term.

Sound

Behind an otherwise factory exhaust the downpipes add clear depth and turbo presence with improved exhaust clarity. Behind a Valvetronic Designs valved system they deliver the full character change, trading the muted factory note for a harder-edged V8 voice that builds with boost.

Features

EPA-compliant 400 cell high-flow catalyst cores
Reduced backpressure for improved turbo spool and mid-range response
Optimized flow architecture that preserves catalyst efficiency
Mandrel-bent tubing for smooth internal transitions
Premium high-grade stainless steel construction
Precision TIG welded throughout
OEM-style sensor placement for correct operation
Direct bolt-on installation using factory mounting locations
Engineered to pair with Valvetronic Designs valved exhaust systems

Applications

Audi RS6 Avant: C8 | 2019-2025 | 4.0L Twin-Turbo V8
Audi RS7 Sportback: C8 | 2019-2025 | 4.0L Twin-Turbo V8

Notes

These downpipes retain high-flow catalysts and are engineered to maintain emissions compliance standards
Professional installation is recommended

Frequently Asked Questions

Will I get a check engine light? Without proper tuning, yes. A high-flow catted version (such as these Valvetronic Designs 400 cell units) paired with an appropriate tune will dramatically reduce the likelihood of a CEL, but no aftermarket downpipe can guarantee a CEL-free outcome.
Is tuning required? While it may not be necessary to tune the vehicle for catted applications, it is a good idea to always tune your vehicle when a significant modification to the exhaust (such as downpipes) is performed to ensure optimum power gains and drivability.
Do I need the OPF section? OPF (Otto Particle Filter) status varies by vehicle and market. Contact us before checkout with your VIN and we will confirm whether the OPF section applies to your specific build.

About Valvetronic Designs

Valvetronic Designs, based in Boyertown, Pennsylvania, is a leader in high-performance exhaust systems, dedicated to innovation, precision, and enhancing the driving experience. Specializing in bespoke solutions for luxury and performance vehicles such as Lamborghini, Ferrari, and Porsche, Valvetronic combines advanced engineering with meticulous craftsmanship to deliver unparalleled sound and performance. With proprietary technologies like free-flow configurations and double X-pipe designs, their exhaust systems set new benchmarks for exotic and race-inspired tones. Every product is designed and manufactured in-house, ensuring exceptional quality and tailored customization, from fitment precision to sound profiles. Driven by a passion for excellence, Valvetronic Designs strives to create the ultimate auditory and performance experiences for automotive enthusiasts worldwide.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Valvetronic Designs 400 Cell Catted Downpipes for C8 Audi RS6 & RS7

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Valvetronic Designs 400 Cell Catted Downpipes for C8 Audi RS6 & RS7

Design and Performance

Construction

Sound

Features

Applications

Notes

Frequently Asked Questions

About Valvetronic Designs

Reviews