Milltek OPF Back Exhaust - BMW F40 M135i xDrive 2019-2025 (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 F40 M135i 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-fitted particulate filter significantly reduces engine noise, and Milltek's carefully tuned system brings out the character of the engine in a controlled and high-quality way.

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

Balanced and sporty sound

Milltek has developed this system specifically for OPF/GPF-equipped M135i xDrive models:

• Deeper and fuller sound at idle

• Clearer and more vibrant sound during acceleration

• Controlled volume at cruising speeds

• No annoying drone in your daily driving

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

Improved flow and ride feel

While the OPF/GPF particulate filter remains in place, the Milltek Particulate Filter-back exhaust system:

• reduces exhaust back pressure after the filter

• supports engine's sensitive throttle response

• improves overall driving experience

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

Direct bolt-on installation

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

• compatible with xDrive transmission

• for installation without welding or permanent changes

OEM-level fit and finish ensure a discreet and high-quality 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 choice of materials meets Milltek's premium quality standard.

Fit

• BMW M135i xDrive 5-door (F40)

Engine: 2.0 Turbo
OPF/GPF equipped models only
xDrive
Model years 2019–2025