Audi S8 Downpipes – Catted & Decat Performance Exhaust Upgrades

Audi S8 Downpipes – Unleash the Full Potential of Your Twin-Turbo V8

The Audi S8 represents the pinnacle of luxury performance sedans in the Audi lineup, combining cutting-edge technology, refinement, and blistering power. Equipped with the 4.0 TFSI twin-turbo V8 in most modern generations, the S8 delivers impressive performance straight from the factory. However, the restrictive OEM downpipe limits exhaust flow, turbo response, and overall power potential. Upgrading to a performance Audi S8 downpipe is one of the most effective modifications to unlock hidden horsepower, improve drivability, and enhance your exhaust sound.

Why Upgrade to a Performance Audi S8 Downpipe?

The stock downpipe is designed primarily for emissions compliance and noise reduction, but this sacrifices performance. Installing a high-flow Audi S8 downpipe offers several key benefits:

• Significant horsepower and torque gains – optimized exhaust flow reduces backpressure and improves engine efficiency.
• Faster turbo spool – sharper throttle response and reduced lag improve acceleration.
• Enhanced exhaust tone – catted downpipes deliver a sporty yet refined sound, while decat downpipes unleash an aggressive motorsport-inspired roar.
• Lower exhaust gas temperatures – better heat management during spirited driving or track sessions.
• Perfect for ECU tuning – an essential upgrade for Stage 1, Stage 2, and hybrid turbo builds.

Types of Audi S8 Downpipes

Our range of Audi S8 performance downpipes is designed for various tuning goals and driving preferences:

Catted Audi S8 Downpipes

Catted downpipes integrate a high-flow sports catalytic converter, balancing emissions compliance with improved performance. Perfect for daily-driven builds in regions requiring emissions testing.

Decat Audi S8 Downpipes

Decat downpipes remove the catalytic converter entirely, maximizing exhaust flow and peak power output. Best suited for track-focused builds and regions without emissions restrictions.

Material Options: Stainless Steel & Titanium

The choice of material affects durability, thermal properties, and weight:

• Stainless steel downpipes – durable, corrosion-resistant, and cost-effective.
• Titanium downpipes – ultra-lightweight, heat-resistant, and premium motorsport aesthetics.

Engine Compatibility

Our Audi S8 downpipes are engineered to fit multiple generations and engine configurations:

• Audi S8 D4 4.0 TFSI Downpipes – optimized for twin-turbo V8 setups from 2012–2018.
• Audi S8 D5 4.0 TFSI Downpipes – designed for the latest generation featuring mild-hybrid integration.
• Audi S8 Plus Downpipes – built for the high-output S8 Plus twin-turbo variant.

Performance Gains with Audi S8 Downpipes

Installing a performance Audi S8 downpipe offers immediate and measurable results:

• +30–60 HP with a downpipe upgrade alone.
• +70–110 HP when combined with Stage 2 ECU remapping.
• Substantial torque increases across the rev range.
• Sharper throttle response and reduced turbo lag.

Choosing the Right Diameter

Selecting the proper downpipe diameter is essential for maximizing gains:

• 2.75-inch downpipes – ideal for Stage 1 tuning and lightly modified builds.
• 3-inch downpipes – recommended for Stage 2 setups, hybrid turbos, and high-boost applications.

All our Audi S8 downpipes are designed for direct bolt-on installation, ensuring perfect fitment without cutting or welding.

Build Quality & Engineering

Every performance Audi S8 downpipe is manufactured with the highest precision to ensure durability and optimal performance:

• Mandrel-bent tubing for smooth, unrestricted exhaust flow.
• Precision TIG welding ensures strength and leak-free construction.
• OEM-style flanges and fittings guarantee seamless integration.
• Available in resonated and non-resonated versions.

Tuning Potential

Pairing your Audi S8 downpipe with ECU tuning unlocks the engine’s full potential:

• Significant horsepower and torque increases.
• Improved boost control and optimized fueling strategies.
• Custom exhaust sound profiles based on catted or decat configuration.

Daily Driving vs Track Builds

For daily-driven builds, catted downpipes provide a perfect balance of performance and emissions compliance. For dedicated track setups, decat downpipes maximize flow, top-end power, and deliver a motorsport-inspired exhaust tone.

Conclusion

Upgrading to a performance Audi S8 downpipe is one of the most effective ways to unlock hidden power, improve turbo spool, and enhance your exhaust sound. Whether you choose a catted or decat configuration, our selection of Audi S8 downpipes guarantees premium quality, precise fitment, and proven gains. Experience the ultimate in performance and luxury with your Audi S8.