Audi RS4 Downpipes – Catted & Decat Performance Exhaust Upgrades

Audi RS4 Downpipes – Unlock the Full Potential of Your V6 or V8 Engine

The Audi RS4 is one of the most iconic performance models in the Audi Sport lineup. Across its generations – including the B5, B7, B8 and B9 platforms – the RS4 has delivered exhilarating power, precision handling and unmistakable style. While each generation offers impressive factory performance, the restrictive OEM downpipes limit what these engines can truly achieve. Upgrading to performance Audi RS4 downpipes is one of the most effective modifications to increase power, improve throttle response and enhance your exhaust tone.

Why Upgrade to a Performance Audi RS4 Downpipe?

The factory downpipes are designed to comply with emissions and noise regulations but come at the cost of restricted exhaust flow. Installing high-flow RS4 downpipes provides multiple advantages:

• Significant horsepower & torque gains – improved exhaust flow reduces backpressure and unlocks hidden power.
• Faster turbo spool (for turbocharged engines) – improved efficiency delivers sharper throttle response.
• Enhanced exhaust note – catted downpipes provide a refined sporty sound, while decat downpipes unleash a motorsport-inspired roar.
• Lower exhaust gas temperatures – improved thermal performance protects the engine under demanding conditions.
• Perfect for ECU tuning – essential for Stage 1, Stage 2 and hybrid turbo or supercharger builds.

Types of Audi RS4 Downpipes

Our selection of Audi RS4 downpipes is engineered for different performance levels and driving needs:

Catted Audi RS4 Downpipes

Catted downpipes include a high-flow sports catalytic converter that balances emissions compliance with enhanced exhaust flow. Perfect for street-driven RS4s in regions requiring emissions testing.

Decat Audi RS4 Downpipes

Decat downpipes eliminate the catalytic converter entirely, maximizing exhaust flow and unlocking peak power. Best suited for off-road builds and track-focused applications.

Material Options: Stainless Steel & Titanium

The choice of material impacts performance, weight and heat resistance:

• Stainless steel downpipes – durable, corrosion-resistant and ideal for most setups.
• Titanium downpipes – ultra-lightweight, exceptional thermal properties and a premium motorsport finish.

Engine Compatibility by Generation

Our Audi RS4 downpipes are engineered for different RS4 platforms and engine configurations:

• Audi RS4 B5 Downpipes – designed for the legendary 2.7 BiTurbo V6 engine.
• Audi RS4 B7 Downpipes – optimized for the high-revving 4.2L V8 naturally aspirated engine.
• Audi RS4 B8 Downpipes – built for the 4.2 FSI V8 delivering exceptional top-end performance.
• Audi RS4 B9 Downpipes – developed for the modern 2.9 TFSI twin-turbo V6 platform.

Performance Gains with Audi RS4 Downpipes

Replacing your OEM downpipe with a performance RS4 downpipe yields measurable results across all generations:

• +20–35 HP with a downpipe alone.
• +40–70 HP when combined with Stage 2 ECU remapping.
• Increased torque for improved mid-range response and acceleration.
• Sharper throttle response and improved engine efficiency.

Choosing the Right Diameter

Selecting the correct downpipe diameter is crucial for performance optimization:

• 2.75-inch downpipes – ideal for mildly tuned Stage 1 setups.
• 3-inch downpipes – recommended for Stage 2 tuning, hybrid turbo builds and high-performance applications.
• 3.5-inch downpipes – designed for big turbo conversions and extreme tuning setups.

All Audi RS4 downpipes are engineered for direct bolt-on installation, ensuring seamless fitment without cutting or welding.

Build Quality & Engineering

Our performance Audi RS4 downpipes are manufactured to the highest standards:

• Mandrel-bent tubing ensures smooth, unrestricted exhaust flow.
• Precision TIG welding guarantees superior strength and durability.
• OEM-style flanges and fittings allow for perfect integration.
• High-quality gaskets and mounting hardware are included for easy installation.

Tuning Potential

Pairing your RS4 downpipe with ECU tuning unlocks its full capabilities:

• Optimized fueling and boost control for maximum power gains.
• Customizable exhaust tone depending on catted or decat configurations.
• Supports advanced setups including ethanol blends, hybrid turbos and supercharger upgrades.

Recommended Upgrades

For maximum performance gains, combine your Audi RS4 downpipe with complementary upgrades:

• Turbo gaskets
• Mounting flanges
• Blow-off valves
• Performance intercoolers
• ECU tuning solutions

Conclusion

Upgrading to a performance Audi RS4 downpipe is one of the most effective ways to increase horsepower, improve throttle response and enhance exhaust sound. Whether you choose a catted or decat downpipe, our selection ensures premium quality, precise fitment and proven results. Transform your RS4 into a true performance machine today.