Milltek Cat Back Exhaust - BMW E82/E82 135i N55 (ECE approved)

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 Secondary Cat Back exhaust system is designed for BMW E82/E88 135i models with the N55 engine. This system is an excellent choice for the driver who wants to improve the sound quality and flow of their car without touching the primary catalytic converters.

The Secondary Cat Back system replaces the section of the exhaust system after the rear catalytic converters , retaining key components of the emissions system but freeing up the engine's soundstage and improving exhaust flow.

Rich and sporty N55 sound

Milltek has tuned this system specifically to suit the nature of the N55 engine:

• Deeper and fuller sound at idle

• Clearer and more powerful sound during acceleration

• Sporty yet controlled sound at high revs

• No annoying resonance or drone during normal driving

The sound profile adds a distinctly sporty touch to the car's character while maintaining good driving comfort.

Improved flow and driving experience

Milltek Secondary Cat Back Exhaust System:

• reduces exhaust back pressure after secondary catalytic converters

• supports engine's sensitive throttle response

• improves the overall driving experience

The freer-flowing structure also supports moderate power upgrades.

Easy bolt-on installation

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

• for installation without welding or permanent changes

• to work seamlessly with the standard front end

OEM-level fit ensures effortless installation and a clean finish.

304L Aircraft Grade Stainless Steel

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

• excellent corrosion and heat resistance

• long service life

• carefully finished TIG welds

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

Fit

• BMW 135i Coupe (E82)

• BMW 135i Convertible (E88)

Engine: 3.0 Turbo (N55)
Model years 2010–2012