Milltek OPF Back Exhaust - BMW F90 M5 OPF 2020-2021

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 Particulate Filter-back exhaust system is designed for BMW F90 M5 and M5 Competition models with a factory-fitted OPF/GPF particulate filter . This system improves exhaust flow and sound while keeping the original particulate filter in place, ensuring the car's daily drivability and emissions system performance remain intact.

The Particulate Filter-back solution replaces the section of the exhaust system after the particulate filter , reducing excess back pressure, increasing sound depth and improving response without compromising comfort.

Rich and refined V8 sound

Milltek has modeled this system to match the sound of the S63 V8 engine:

• Deeper bass and richer sound at idle

• Stronger and more dynamic sound during acceleration

• Sporty but controlled sound at high revs

• No annoying resonance or drone when driving on the road

The sound profile complements the powerful character of the S63 engine in a refined and sporty way.

Improved exhaust flow and response

While the original OPF/GPF filter is kept in place, Milltek's Particulate Filter-back system:

• reduces exhaust back pressure after the filter

• supports engine's sensitive throttle response

• improves the overall driving experience

• retains OEM component functionality and connectivity

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

Direct bolt-on installation

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

• compatible with all-wheel drive and electronic driving settings

• for installation without welding or permanent changes

OEM-level fit ensures 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:

• high corrosion and heat resistance

• longevity in intensive use

• flow-optimized structure

• carefully finished TIG welds

The choice of materials meets Milltek's premium quality standards.

Fit

• BMW M5 (F90)

• BMW M5 Competition (F90)

Engine: 4.4 Twin Turbo V8 (S63)
Only OPF/GPF equipped cars
Model years 2020–2021