CAP Can Auto Performance Audi 3.0T Cast V3 Catted Downpipe - B9/B9.5 2018-2025 Audi S4/S5 V3

World's Best Catted Downpipe for the B9/B9.5 Audi S4/S5 3.0T

Introducing the long awaited V3 Cast Heatshield Catted Downpipe from Can Auto Performance — the most refined and powerful evolution of our high-flow downpipe lineup for the B9 S4/S5 3.0T platform.

For 2025, we’ve taken everything that made our V1 and V2 downpipes great and raised the bar even higher. This all-new V3 version features a cast stainless steel construction, allowing for smoother flow transitions and enhanced durability all while wrapped in our signature integrated heatshield for reduced engine bay temperatures.

Designed for enthusiasts who demand both performance and precision, this downpipe doesn’t just look the part, it delivers results.

It's time to increase your B9 Audi S4/S5's power, by increasing exhaust flow.

Experience increased horsepower, faster turbo response, and a meaner exhaust note. Easy to install and built to last your car's lifetime.

We have to thank Audi for the design of the OEM cat, compared to the B8/B8.5 S4/S5 platform, replacing cats was a total nightmare on those cars. Although professional install is always recommended, the install time of this downpipe generally only takes around the 2 hour mark.

Key Features Of Our 3.0T Downpipe For B9/B9.5 Platform:

• Cast 304 Stainless Steel Construction – Stronger, smoother, and more thermally stable
• 200 Cell High-Flow Catalytic Converter: Optimized for performance while maintaining high flow catalytic function
• Integrated Heatshield – Keeps under-hood temps in check and protects nearby components
• TIG Welded & Back-Purged – Ensures strength and durability where it matters
• Precision-Cut CNC Flanges – OEM-like fitment, no cutting or welding required
• Bolt-On Installation – Includes all necessary hardware, gaskets & bolts
• Enhanced Flow – For increased HP, torque, and turbo response
• Aggressive Exhaust Note – Deep tone without drone on stock exhaust
• Tuned Aesthetic – Clean, robust, and designed to impress at first glance

The removal of factory catalytic converters will trigger a check engine light. Software tunes are recommended to maximize the power gains.

Important Notice:
This product is for Racing Competition only and is not legal for use in highway or street vehicles or other non-racing competition off-road vehicles. By purchasing this product you acknowledge its intended use and represent that you understand and agree that the product is not designed to meet any applicable emissions standards, the product is not C.A.R.B. complaint. Can Auto Performance makes no representations, warranties or claims that this product complies with any applicable emissions laws and expressly disclaims any and all such representations, warranties and claims, whether express or implied. By purchasing this product, you represent, warrant and agree that it is your responsibility to inform yourself of any laws or regulations that may apply to your purchase and/or use of the product.

Warranty Disclaimer

Catalytic converters are considered a wear item and are not covered by warranty.

The warranty is void under the following conditions:

• Aggressive burble, crackle, anti-lag, or flame-producing tuning
• Two-step launch control or unburnt fuel detonation in the exhaust
• Sustained high-heat use such as drag racing or track driving
• Improper installation or physical damage

These conditions exceed normal operating limits and can lead to premature catalytic failure. For build-specific compatibility, please contact us prior to purchase.