Akrapovič BMW M240i (G42) Slip-On Line Exhaust System
Offering significant weight savings, increased power and torque, and a dramatic sound experience, this exhaust system is constructed from lightweight high-grade titanium and finished with hand-crafted carbon-fibre tailpipes. On the Akrapovič dyno, this system showed an increase of 7.1 kW (9.7 hp) at 2,450 rpm and 20.5 Nm of torque at 2,450 rpm when compared to a BMW M240i with the standard stock exhaust.
The system delivers an exhilarating soundtrack, thanks to special components integrated into the design. Unlike the stock configuration, which uses a single valve, this system features two valves, each precisely calibrated to tailor the sound. Additionally, two acoustic reflectors are fitted to the tailpipes, guiding the sound into the car’s cabin to create an immersive auditory experience that enhances the driving thrill for all occupants. To accommodate the additional exhaust valve, the product includes a TNG controller, ensuring seamless activation. The sound experience is further perfected with two resonators, one on each side of the central muffler.
At normal cruising speeds, the exhaust produces a smooth, rich sound that rises to a deep, sporty soundtrack when driving more enthusiastically. The tones can also be adjusted from within the cockpit with the addition of the optional Akrapovič Sound Kit. Special parts, cast in Akrapovič’s in-house foundry, contribute to the intricate and complex design of this system.
The exhaust system meets ECE type approval, and no remapping is required for this configuration (the ECE certificate is valid only for cars equipped with OPF).
Please note, an additional stock valve actuator (part number 18 30 8 686 640) is required when installing the Slip-On exhaust system on the BMW M240i (G42).
Exhaust Data
| Unit | Stock | Akrapovič | Max gain | |
|---|---|---|---|---|
| Max. power | kW | 278.9 / 5900 rpm | 279.5 / 5850 rpm | + 7.1 / 2450 rpm |
| HP (m) | 379.2 / 5900 rpm | 380 / 5850 rpm | + 9.7 / 2450 rpm | |
| HP (i) | 374 / 5900 rpm | 374.8 / 5850 rpm | + 9.5 / 2450 rpm | |
| Max. torque | Nm | 522.8 / 2900 rpm | 530.3 / 2900 rpm | + 20.5 / 2450 rpm |
| lb-ft | 385.6 / 2900 rpm | 391.1 / 2900 rpm | + 15.1 / 2450 rpm | |
| Weight | kg | 17.74 | 13.7 | – 4 |
| lb | 39.1 | 30.2 | – 8.9 | |
| % | – 22.8 | |||
| Inst. time | min | 210 |




