BMW G20/G21, 320i/330i Catless Downpipe With Heat Shield

BMW G20/G21, 320i/330i Catless Downpipe With Heat Shield

Get the most flow possible from your BMW G20/G21 320i or 330i with this Catless Downpipe With Heat Shield, engineered to remove the restrictive factory catalytic converter, cut exhaust backpressure and unleash a louder, more aggressive B48 exhaust note.

Designed specifically for the 2.0L turbocharged four-cylinder G20 Sedan and G21 Touring, this downpipe replaces the factory unit directly after the turbocharger with a straight, unrestricted flow path. The turbo spools faster and works more efficiently, giving a tuned B48 the strongest foundation for more power.

Manufactured from premium 304 stainless steel with precision TIG welding and wrapped in high-temperature thermal heat shielding, it helps keep engine bay temperatures down and protects surrounding components from radiant heat.

Key Features

Catless Design for Maximum Flow

Removes the catalytic converter entirely for the least restrictive exhaust path and the biggest gains from a tune.

Integrated Thermal Heat Shielding

Helps reduce radiant heat and protects surrounding engine bay components from excessive temperatures.

Premium 304 Stainless Steel Construction

Manufactured from corrosion-resistant stainless steel for exceptional durability and heat resistance.

Braided Flex Section

Absorbs engine movement and vibration, protecting the welds and joints throughout the system.

Improved Turbo Efficiency

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

Precision TIG Welded

Strong, clean welds engineered to withstand extreme temperatures and demanding performance applications.

Direct Bolt-On Fitment

Designed specifically for the BMW G20/G21 320i and 330i using factory mounting locations.

Performance Benefits (When Tuned)

• Increased horsepower and torque potential
• Faster turbo spool and improved throttle response
• Maximum reduction in exhaust backpressure
• Enhanced turbocharger efficiency
• Increased turbo whistle and induction acoustics
• Ideal foundation for Stage 2 and higher-performance builds

Performance gains may vary depending on ECU calibration, fuel quality and supporting modifications.

Sound Characteristics

• Deeper and more aggressive exhaust tone
• Increased turbo spool and whistle acoustics
• Louder cold starts
• Enhanced pops and burbles (when tuned)
• Maximum exhaust flow and sound

Vehicle Fitment

BMW G20 320i Sedan (2019+)
BMW G20 330i Sedan (2019+)
BMW G21 320i Touring (2019+)
BMW G21 330i Touring (2019+)

2.0L Turbocharged Four-Cylinder Engine

Please Note

Professional installation is strongly recommended.

The catless version is intended for off-road and motorsport use only.

Vehicles fitted with an OPF/GPF may require a different configuration. Contact us before ordering if you are unsure.

Most parts in our BMW 320i/330i range are made to order rather than held in stock, so please allow extra time for dispatch.

Why Choose Proven Performance Parts

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