B9/B9.5 3.0T Cast V3 Catless Downpipe V3 | Audi B9/B9.5 S4, S5 | Canadian Auto Performance

Overview

CAP B9/B9.5 Catless 3.0T Downpipe Introducing the long awaited V3 Cast Catless 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. We also offer a heatshielded variant, which help reduce 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 with this Cast downpipe. 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.

Details

• Key Features Of Our 3.0T Downpipe For B9/B9.5 Platform: Cast 304 Stainless Steel Construction – Stronger, smoother, and more thermally stable 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 Important Note : The removal of factory catalytic converters will trigger a check engine light .
• Software tunes are recommended to maximize the power gains.
• Heat Shielded vs.
• Non-Heat Shielded Downpipes - What to Choose?
• When it comes to choosing between heat shielded and non-heat shielded downpipes for your Audi B9/B9.5 S4/S5, understanding the pros and cons of each option will help you maximize performance and protect your engine components.
• Here’s a quick overview to make things easy: Benefits of Heat-Shielded Downpipes for your B9/B9.5 Audi S4/S5 Heat shielded downpipes offer several advantages that can significantly improve your Audi's performance and longevity: Reduced Heat Soak : By effectively managing exhaust heat, heat shields prevent excessive temperatures from affecting nearby components , reducing the risk of heat soak and maintaining optimal engine performance.
• Enhanced Engine Bay Protection : Heat shields act as a barrier, protecting sensitive components such as electrical systems, fuel lines, and wiring harnesses from heat-related damage.
• Improved Air Intake Temperature : By keeping engine bay temperatures lower, heat shields help maintain cooler air intake temperatures, leading to better combustion and increased power output.
• Optimized Exhaust Flow : Heat shielding helps maintain higher exhaust gas temperatures, which can improve exhaust flow and scavenging, potentially leading to better turbocharger performance and faster spool times.
• Noise and Vibration Reduction : Heat shields can also help dampen noise and vibrations, contributing to a more refined driving experience.
• For performance enthusiasts looking to maximize their Audi's potential, the benefits of heat shielded downpipes often outweigh the negligible increase in weight and cost.
• Key safeguards include: Optimized airflow that maintains safe EGTs (exhaust gas temperatures), unlike cheap aftermarket pipes causing thermal runaway.

Fitment Notes:

• Equipped 3.0 TFSI EA839 Turbocharged V6

Fitment