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

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 Cat Back exhaust system is designed for the BMW F90 M5 and M5 Competition models with the 4.4-liter twin turbo V8 (S63) and factory-fitted OPF/GPF particulate filter . The factory system effectively dampens sound and restricts flow, and the Milltek Cat Back solution is developed to unleash the character of the V8 engine in a controlled and high-quality way, while maintaining the car's premium driving comfort.

The Cat Back system replaces the section of the exhaust system after the downpipe , improving exhaust flow and bringing significantly more depth and sportiness to the engine sound.

Powerful and refined V8 sound

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

• Deeper and fuller V8 sound at idle

• Clear and powerful sound during acceleration

• Sporty yet controlled sound at high revs

• No annoying resonance or drone at cruising speeds

The sound profile audibly highlights the M5's performance without compromising daily drivability.

Improved flow and ride feel

Milltek Cat Back Exhaust System:

• reduces exhaust back pressure after the particulate filter

• supports engine's sensitive throttle response

• improves the overall driving experience

The more free-flowing design also supports performance-oriented software updates.

Direct bolt-on installation

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

• compatible with the M5's all-wheel drive system and active driving settings

• for installation without welding or permanent changes

OEM-level fit ensures effortless installation and a clean 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 high quality and durability standards.

Fit

• BMW M5 (F90)

• BMW M5 Competition (F90)

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