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

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

Unlock more from your BMW G20/G21 320i or 330i with this High-Flow Catted Downpipe With Heat Shield, engineered to reduce exhaust backpressure, sharpen turbo response and bring out more of the B48's character while keeping a high-flow catalytic converter in the system.

Designed specifically for the 2.0L turbocharged four-cylinder G20 Sedan and G21 Touring, this downpipe replaces the restrictive factory unit directly after the turbocharger. The smoother, less restrictive flow path lets the turbo spool faster and work more efficiently, making it one of the most effective supporting upgrades for a tuned B48.

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

High-Flow Catalytic Converter

Retains a high-flow catalytic converter for a more refined sound and a more road-friendly setup than a catless pipe, while flowing far better than the factory unit.

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
• Reduced exhaust backpressure
• Enhanced turbocharger efficiency
• Increased turbo spool acoustics
• Ideal foundation for Stage 1 and Stage 2 builds

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

Sound Characteristics

• Sportier and more refined exhaust note
• Increased turbo spool acoustics
• More volume without excessive harshness
• Excellent balance between performance and everyday drivability

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.

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.