Milltek OPF Back Exhaust - BMW G20/G21 M340i xDrive OPF (ECE approved)

QT Parts is a Finnish online store.

Our warehouse is located in Nokia, Finland.

You can collect your order directly from us if needed. Simply select “Pickup” at checkout.

Pay securely with multiple payment methods, including invoice and installment plans through Klarna.

The delivery time for products in stock is 1-5 business days. We ship worldwide.

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. International orders may be subject to VAT, import duties, and customs fees upon arrival in the destination country.

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 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 Particulate Filter-back exhaust system is designed for BMW G20 and G21 trim M340i xDrive drivers who want to improve the sound quality and driving experience of their car while retaining the original OPF/GPF particulate filter. The factory-installed particulate filter significantly dampens the sound of the B58 engine, and Milltek's carefully tuned system unleashes the engine's character in a controlled and balanced manner.

The Particulate Filter-back system replaces the section of the exhaust system after the particulate filter, improving flow and adding depth to the sound without excessive noise or disturbing resonance.

Balanced and refined B58 soundscape

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

• Deeper and fuller sound at idle

• Clearer and more vibrant sound during acceleration

• Controlled and pleasant volume at cruising speeds

• No annoying drone or unpleasant resonance

The sound profile is ideal for everyday driving, but adds a distinctly sporty touch to the car's character.

Improved flow and driveability

While the OPF/GPF remains in place, Milltek's flow-optimized design:

• reduces exhaust back pressure after the particulate filter

• supports engine's sensitive throttle response

• improves the overall driving experience

The system works seamlessly with the car's original driving settings and powertrain.

Direct bolt-on installation

The Milltek Particulate Filter-back exhaust system is designed to:

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

• compatible with xDrive transmission

• for installation without welding or permanent changes

• ECE-approved piping, road traffic approved

Installation is straightforward and the OEM-level fit ensures a seamless finish.

304L Aircraft Grade Stainless Steel

The entire 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 selection of materials ensures durability even in demanding use.

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