BMW G90/G99 M5 Catless Downpipe

BMW G90/G99 M5 Catless Downpipe

Unlock the true performance potential of your BMW G90/G99 M5 with this High-Flow Catless Downpipe — engineered to maximise exhaust flow, improve turbocharger efficiency, and unleash the full sound and performance of BMW's latest twin-turbocharged S68 V8 powertrain.

Designed specifically for the G90 M5 Sedan and G99 M5 Touring, this catless downpipe removes the restrictive factory catalytic converters, significantly reducing exhaust backpressure and allowing the turbochargers to spool faster and operate more efficiently. The result is improved throttle response, enhanced power potential, and a far more aggressive exhaust note.

Manufactured from premium mandrel-bent 304 stainless steel and precision TIG welded throughout, this downpipe is built to withstand extreme temperatures and high-performance driving conditions while maintaining OEM-style fitment and reliability.

Whether you're building a Stage 2 setup or preparing for future performance upgrades, this catless downpipe provides one of the most effective power-supporting modifications available for the S68 platform.

Key Features

High-Flow Catless Design

Removes the restrictive factory catalytic converters to maximise exhaust flow and performance potential.

Premium 304 Stainless Steel Construction

Manufactured from corrosion-resistant stainless steel for exceptional durability and long-term reliability.

Improved Turbo Efficiency

Reduced exhaust backpressure allows the turbochargers to spool faster and operate more efficiently.

Mandrel-Bent Tubing

Maintains consistent pipe diameter throughout the system for unrestricted exhaust flow.

Precision TIG Welded

High-quality welds engineered to withstand extreme temperatures and demanding performance applications.

Direct Bolt-On Fitment

Designed specifically for the BMW G90 and G99 M5 using factory mounting locations.

Performance Benefits (When Tuned)

• Increased horsepower and torque potential
• Faster turbo spool and improved throttle response
• Reduced exhaust backpressure
• Enhanced turbocharger efficiency
• More aggressive V8 exhaust note
• Increased turbo acoustics and induction sounds
• Ideal foundation for Stage 2 and higher-performance builds

Performance gains will vary depending on tuning, fuel quality, and supporting modifications.

Sound Characteristics

Compared to the factory downpipes, this catless system typically delivers:

• Deeper and more aggressive exhaust tone
• Increased turbo spool and induction noise
• Louder cold starts
• Enhanced pops and overrun characteristics (when tuned)
• Greater exhaust volume throughout the rev range
• More pronounced V8 character and presence

Vehicle Fitment

BMW G90 M5 Sedan (2025+)
BMW G99 M5 Touring (2025+)

4.4L Twin-Turbocharged S68 V8 Hybrid Powertrain

Please Note

This is a catless motorsport product intended for off-road and motorsport use only.

Professional installation is strongly recommended.

European OPF-equipped vehicles utilise the OPF system within the mid-pipe section. Compatibility with aftermarket OPF and non-OPF mid-pipes should be confirmed prior to ordering.

ECU tuning may be required to fully utilise the performance benefits and prevent potential check engine lights associated with catalyst removal.

Why Choose Proven Performance Parts

We specialise in high-performance parts for European vehicles — including Volkswagen GTI & R models, Audi S/RS platforms, and BMW M vehicles. Every product we offer is carefully selected for its quality, fitment, and real-world performance — tested by enthusiasts, for enthusiasts.