Audi S4 / S5 B9 Catless Downpipe
Unleash the True Potential of Your 3.0T EA839 Engine
Engineered specifically for the Audi B9/B9.5 S4 and S5 (2017-2025) 3.0TFSI V6, this catless downpipe is designed to eliminate factory exhaust restrictions, unlock significant power gains, and transform your driving experience. Built for performance enthusiasts, it combines premium materials, precision craftsmanship, and race-proven design to deliver unrestricted exhaust flow and aggressive sound.
Key Features & Benefits
✅ Unrestricted Exhaust Flow for Maximum Power
- Removes the factory restrictive primary catalytic converter, allowing exhaust gases to exit the turbocharger with zero backpressure.
- Enables faster turbo spool-up, improved throttle response, and substantial horsepower and torque gains, especially when paired with a Stage 2 ECU tune.
- Supports hybrid turbo upgrades and high-performance builds, ensuring your engine breathes freely at all RPM ranges.
✅ Premium T304 Stainless Steel Construction
- Built from high-grade T304 stainless steel, this downpipe resists corrosion, rust, and thermal fatigue, even under extreme high-heat conditions.
- Polished mirror finish adds a premium, race-inspired look under the hood, while the durable material guarantees long-lasting reliability.
✅ Precision Hand TIG Welded
- Every weld is expertly handcrafted for superior strength, leak-free performance, and a clean, professional appearance.
- Smooth mandrel-bent tubing eliminates sharp corners and flow disruptions, maximizing exhaust velocity and efficiency.
✅ Direct Bolt-On Installation
- Designed as a direct factory replacement with no modifications required, ensuring a perfect fit for all Audi B9/B9.5 S4/S5 3.0T models.
- Includes all necessary hardware (gaskets, bolts, and clamps) for a hassle-free installation, saving you time and extra costs.
- Features integrated O2 sensor bungs to retain sensor functionality, supporting aftermarket tuning solutions.
✅ Aggressive Exhaust Note
- Delivers a deeper, more aggressive exhaust tone, eliminating the flat, muted sound of the factory system.
- Enhances the signature growl of the 3.0T V6, giving your Audi a performance-inspired sound profile without unwanted drone at cruising speeds.
Performance Highlights
- Turbo Response: Reduces turbo lag significantly, resulting in sharper throttle response and instant power delivery.
- Power Gains: Supports up to 40+ HP and 35+ ft-lbs of torque gains when paired with supporting modifications and tuning.
- Long-Term Durability: Resists cracking and degradation from high exhaust temperatures, ideal for daily driving and track use alike.
