Milltek Cat Back Exhaust - BMW G20/G21 M340i xDrive OPF

The delivery time for products in stock is 1-3 business days.

If the product is not in stock and it is a pre order product, the average delivery time is 5-21 business days. If the product has a longer delivery time than previously announced, we will be in touch.

Terms for product returns:

• You must return the ordered products within 14 days of receiving
• The products must be unused and without damages
• Commission fee for handling returns is 21,90€
• For product returns, the customer is in charge of the return costs. Only door to door service (Express)
• Shipping costs are not refunded

For international orders (outside of Europe) sales are final and non-refundable. Once an order is placed, it cannot be canceled or returned. By placing an order, you acknowledge and agree to these terms.

Return address: QT Parts, Vasarakatu 8B, 37150 Nokia, Finland.

Pre order / made-to-order products

If the product you have ordered is a pre order or made-to-order item, it is not subject to the 14-day right of withdrawal or return under consumer protection laws, as the product is manufactured or sourced specifically based on the customer’s individual order.

If you wish to cancel your order before receiving the product, we will refund 50% of the total order amount.

This condition applies to the following product categories:

• Suspension
• Engine Tuning
• Engine Parts
• Exhaust Systems
• Fueling
• Turbochargers/superchargers
• Drivetrain
• ECE-approved Downpipes

All of the above products are manufactured or sourced individually based on the customer’s order, and therefore cannot be returned after delivery, unless the product has a manufacturing or material defect.

In the event of such a defect, the standard liability for defects as provided by consumer protection legislation shall apply.

The Milltek Sport Cat Back exhaust system is designed for BMW G20 and G21 trim M340i xDrive drivers who want more sound, character and a sporty feel without compromising the car's everyday usability. The factory-installed OPF/GPF system significantly dampens the sound of the B58 engine, and Milltek's Cat Back solution restores the engine's deserved, cleaner and sportier soundscape.

This exhaust removes the OPF system. If you want an OPF back exhaust that does not remove OPF, click HERE

The Cat Back system replaces the section of the exhaust system after the particulate filter and provides improved flow, a richer sound and a more visually appealing overall appearance.

Balanced and sporty B58 sound

Milltek has tuned this system specifically for OPF/GPF models:

• Deeper and fuller sound at idle

• Clearer and more powerful midrange

• Sporty but controlled sound during acceleration

• No annoying resonance or drone when driving on the road

The soundscape highlights the character of the B58 engine without being excessively loud, making it an excellent choice for daily driving.

Direct bolt-on installation

The Milltek Cat Back is designed to:

• to fit directly into the car's original mounting points

• compatible with xDrive transmission

• for installation without welding or permanent changes

The system fits OEM-level and retains the car's original functions.

304L Aircraft Grade Stainless Steel

The entire exhaust system is made of high-quality 304L grade stainless steel, which offers:

• excellent corrosion and heat resistance

• long service life

• flow-optimized structure

• carefully finished TIG welds

The high-quality choice of materials ensures durability and a stylish appearance.

Fit

• BMW M340i xDrive Sedan (G20)

• BMW M340i xDrive Touring (G21)

Engine: 3.0 Turbo (B58)
OPF/GPF equipped models only
Model years 2019–2025