Akrapovic Exhaust System for BMW M135i (F40)

Beautifully crafted from high-grade titanium, this lightweight exhaust system is finished with eye-catching carbon-fibre tailpipes and is a full-on sensory delight. The exhaust valve – with its housing cast in the in-house foundry – gives the exhaust a rich sound with an emphasis on high frequencies, especially when shifting through the gears, all allied to a deep tone that enhances the car’s engine without any discomfort or drone for the occupants. A specially engineered Y-split reduces the flow noise without any compromise to the pressure pulse distribution, thus offering a strong sound and optimal flow path. The use of lightweight materials and a different configuration reduces the overall weight of the exhaust by 9.4 kg, a saving of 55.6% on the stock version. The design and construction of the exhaust optimize the power and torque levels throughout the rev range, with performance increased by 3.3 kW (4.5 hp) at 5,350 rpm and torque up by 5.9 Nm at 5,300 rpm. This was achieved during in-house tests with back-to-back runs on the Akrapovic dyno against a BMW M135i using a standard stock exhaust. For a further upgrade of the Slip-On Line (Titanium) exhaust system, an optional Evolution Link pipe set (SS) is available.

The ECE type-approval certificate is valid only for 2020 model year cars equipped with an Otto/gasoline particulate filter.

The exhaust system can be fitted on the BMW M135i XDrive model.

To install the Slip-On Line (Titanium) exhaust system, the stock exhaust system must be cut; please read the instructions carefully before the start of the installation.

The Evolution Link pipe set (SS) was tested and developed together with the Slip-On Line (Titanium) exhaust system to provide an ideal upgrade and greater exhaust tuning potential. The use of this configuration is designed for the racetrack and will offer a sporty sound and higher performance. With the elimination of the OPF, the sound levels and frequency content are emphasized, providing an increased sound, leading to an exhilarating tone with crackling and burbling as an enjoyable aural assault on over-run and when downshifting through gears. The change in performance is a noticeable factor: compared in back-to-back runs on the Akrapovic dyno against a BMW M135i using a standard stock exhaust, there a 5.1 kW (6.9 hp) increase in power at 4,250 rpm and 11.5 Nm of torque is added at 4,250 rpm.

When installing the Evolution Link pipe set (SS), which is developed for use on closed tracks only, remapping of the ECU is mandatory to prevent potential “check engine light” warning signals.

Fitment notice: This product can only be installed on vehicles with the V-clamp connection between the stock downpipe and link pipe. For further information, please read the installation instructions below.

THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.

 The optional Akrapovic Sound Kit enables owners of selected Akrapovic car exhausts to control the sound of the system from the cockpit of their machine. Using Akrapovic technology, drivers can easily switch between the quiet mode and a sportier sound. With the use of a receiver (already included in evolution system) to drive the actuators that open or close the valves at the end of the exhaust system, drivers can use the Sound Remote Controller to regulate the valves.

With the use of the optional Akrapovic Sound Kit, the ECE type approval is no longer valid.

Pictures are symbolic.

Schematic new version:

Performance graph:

Installation instructions - EN:

Installation instructions - DE, IT, FR, ES, PT, SI:

ECE Type-Approval Certificate:

POS HF:

STOCK EXHAUST; BMW M135I

SLIP-ON LINE (TITANIUM); BMW M135I

Schematic new version:

Performance graph:

Installation instructions - EN - BMW M135I Fitting Instructions On NON-OPF Models:

Installation instructions - EN:

Installation instructions - DE, IT, FR, ES, PT, SI:

POS HF:

STOCK EXHAUST; BMW M135I

EVOLUTION LINK PIPE SET; BMW M135I

Schematic new version:

User manual - EN:

Installation instructions - EN:

User manual - DE, IT, FR, ES, PT, SI:

Installation instructions - DE, IT, FR, ES, PT, SI:

POS HF: