BMW G90/G99 M5 Catless Downpipe with Heat Shield

Unlock the true performance potential of your BMW G90/G99 M5 with this Catless Downpipe featuring integrated thermal heat shielding — engineered to maximise exhaust flow, improve turbocharger efficiency, and deliver an aggressive V8 soundtrack worthy of BMW's latest flagship M platform.

Designed specifically for the twin-turbocharged 4.4L S68 V8 engine, this high-flow catless downpipe eliminates the restrictive factory catalytic converters, allowing exhaust gases to exit more efficiently and reducing backpressure throughout the system. The result is faster turbo spool, sharper throttle response, increased power potential, and a significantly enhanced exhaust note.

Constructed from premium 304 stainless steel and wrapped in high-temperature thermal shielding, this downpipe helps reduce engine bay temperatures while maintaining durability under extreme heat and performance conditions. Whether paired with a factory exhaust system or a full aftermarket setup, this upgrade provides the foundation required for serious performance gains.

Perfect for Stage 2 applications and high-performance builds, this downpipe delivers the airflow and efficiency required to unlock the full capability of the S68 platform.

Key Features

High-Flow Catless Design

Removes restrictive factory catalytic converters for maximum exhaust flow and performance.

Integrated Thermal Heat Shielding

High-temperature heat shielding helps reduce radiant heat and protects surrounding engine bay components.

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.

Precision TIG Welded

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

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 and pronounced exhaust note
• 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 V8 exhaust tone
• Increased turbo whistle and induction acoustics
• Louder cold starts
• More pronounced pops and overrun characteristics (when tuned)
• Enhanced overall exhaust presence throughout the rev range

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.

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.