CAP 3.0T Catless Downpipe for 2018-2024 B9/B9.5 Audi S4/S5

Regular B9 S4/S5 Downpipe: In Stock & Ready to Ship!
Heatshielded B9 S4/S5 Downpipe: In Stock & Ready to Ship!

FREE SHIPPING TO LOWER 48 USA!

Choose from CAP's beautiful 304 stainless steel catless downpipe or our 304 stainless steel heatshielded catless downpipe, designed to fit in place of the restrictive factory catalytic converter and provide years of reliable performance.

Introducing the Canadian Auto Performance catless downpipe - Version 2 (V2)! Newly released for 2024, we have redesigned our V1 downpipe from the ground up to maximize the diameter as well as make it look more aesthetically pleasing! You will not be disappointed with, in our opinion, the best looking and the best-flowing downpipe on the market today. 

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. 

What Are the Benefits of a Performance Catless Downpipe?

Installing a B9/B9.5 S4/S5 catless downpipe will increase horsepower and torque, improve exhaust flow & enhance turbo spool-up time. As a result - your car will rev faster and produce a more aggressive exhaust note. This performance upgrade will also reduce turbo lag & enhance throttle response, which can result in better fuel efficiency on the Audi S4/S5 models, compared to restrictive factory parts.

It's time to upgrade your B9 Audi S4/S5's for the highest power gains,  by improving exhaust flow! Experience a meaner exhaust note with the best catless downpipe for your Audi.

Easy to install and built to last your car's lifetime.

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

1. 100% TIG welded & back purged with precise alignment

2. Constructed of top quality 304 Stainless Steel

3. Precision CNC machined flanges

4. Bolt-on installation

5. Faster turbo spool up & better throttle response

6. Improved exhaust note & exhaust flow delivering miles of smiles, 

7. Increased HP and torque compared to stock downpipe

8. No drone with factory exhaust

9. The most aesthetically pleasing downpipe on the market!

10. Install hardware, gaskets & bolts - included!

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:

1. 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.
   

2. 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.
   

3. 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.
   

4. 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.
   

5. 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.

Does a Catless Downpipe Damage an Audi 3.0T Engine?

Let’s cut through the myths: A catless downpipe won’t harm your Audi’s 3.0T engine if properly paired with CAP’s intercooler & performance tune. While generic catless setups risk issues like elevated exhaust temps or lean fuel trims, CAP’s 3.0T downpipes are precision-built to enhance reliability.

Our V2 design uses aerospace-grade 304 stainless steel and mandrel-bent piping to reduce back pressure without overheating turbos or stressing engine components.

Key safeguards include:

• Optimized airflow that maintains safe EGTs (exhaust gas temperatures), unlike cheap aftermarket pipes causing thermal runaway.
• OEM+ compatibility with factory sensors and CAP’s O2 spacers (use code SPACER50) to prevent check-engine lights and fuel trim errors.
• Heat-shielded options (available as add-ons) to protect nearby wiring and components from radiant heat.

The real danger lies in failing factory catalytic converters, which fragment and damage turbos – a problem our downpipes eliminate entirely. 

Is a Catless Downpipe Worth It for Your Audi 3.0T?

For Audi 3.0T owners chasing max power and turbo response, CAP’s catless downpipe is the single most impactful bolt-on mod. Here’s why:

Why CAP’s Version Dominates:

• Track-ready durability: No cracking or warping, even on 800+ HP performance builds.
• Free shipping + no surcharges: We deliver most of our orders for free. Check out our F.A.Q. page for  more info on delivery.
  
  

Pair it with our 3.0T Intercooler to unlock the full performance potential of your Audi.

Still hesitant? Check our Ultimate Audi Mod Guide for dyno-backed proof why this is the enthusiast’s first mandatory upgrade.

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.

Canadian 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.