Akrapovic 2021+ BMW M240I M44OI (G42) Slip-On Line Exhaust (Titanium)(will need BMW#18 30 8 686 640)

Deep B58 Sound and Real Weight Savings for Your G42 BMW M240i With Zero ECU Flashing

The Akrapovic S-BM/T/32H Slip-On Line delivers measurable performance and a transformed exhaust character for the 2022 to 2025 BMW M240i and M240i xDrive without touching the engine tune. Built around a full titanium muffler assembly with hand-crafted carbon fiber tips, the S-BM/T/32H saves 4.0 kg over the OEM system and adds 7.1 kW at 2,450 rpm and 20.5 Nm of torque at the same point, directly improving throttle response and mid-range pull. Two active valves work with the factory chassis electronics for quiet cruising or an aggressive open note on demand. Compatible with OPF and non-OPF G42 variants and ECE type-approved for European road use. Note: The BMW OEM actuator part number 18 30 8 686 640 is required for full active valve function and must be sourced separately from a BMW dealer.

Key Features

• Full Titanium Muffler Body Aerospace-grade titanium construction for superior heat resistance and a 4.0 kg weight reduction over the stock G42 exhaust
• Carbon Fiber Exhaust Tips Hand-laminated carbon fiber tips with Akrapovic laser-etched branding for a premium rear end appearance
• Dyno-Proven Power Gains +7.1 kW at 2,450 rpm and +20.5 Nm torque at 2,450 rpm on the BMW B58 3.0L inline-six
• Dual Active Valve System Two electronically controlled exhaust valves retain factory sound mode integration for quiet or sport operation
• OPF and Non-OPF Compatible Fitment confirmed for both particulate filter-equipped and non-OPF G42 M240i models across all production years
• ECE Type Approved Meets European emissions certification for OPF-equipped vehicles; street legal for road use in compliant markets
• No Cutting or Welding Required Direct bolt-on replacement using factory hanger points and connection flanges
• Handcrafted in Slovenia Produced at Akrapovic's Ivancna Gorica factory alongside motorsport exhaust systems

This Part Fits

Specifications

What's Included

• Titanium slip-on rear muffler assembly with carbon fiber tips (S-BM/T/32H)
• Stainless steel mounting clamps and hardware kit
• Akrapovic installation instructions with torque specifications

Frequently Asked Questions

Yes. To retain full active valve functionality with your factory driving modes, you need BMW OEM actuator part number 18 30 8 686 640, which must be ordered from a BMW dealer. The S-BM/T/32H muffler will physically install without it, but valve control will not operate correctly until the actuator is fitted.

Yes. The S-BM/T/32H was developed specifically for the G42 platform and is confirmed compatible with both OPF and non-OPF equipped M240i models across all production years 2022 through 2025. Fitment is identical for both variants.

Yes. Both the rear-wheel-drive M240i and the all-wheel-drive M240i xDrive share the same G42 exhaust configuration. The S-BM/T/32H fits both drivetrain variants without modification.

On the G42 M240i with the B58 3.0L inline-six, Akrapovic dyno results show gains of 7.1 kW (9.7 hp) at 2,450 rpm and 20.5 Nm of additional torque at the same rpm. These gains are particularly noticeable in the mid-range where the B58 already builds strong pull.

Yes, with one condition. The ECE type approval is valid for G42 M240i vehicles equipped with the Otto particulate filter (OPF). For non-OPF vehicles, the system fits but does not carry ECE certification for on-road use in European markets. In the US, OEM-downstream slip-on systems typically do not affect emissions compliance.

Installation on a lift with hand tools takes approximately 3 to 4 hours when the BMW OEM actuator is also being fitted. The slip-on muffler itself is a direct bolt-on requiring no cutting. Professional installation at a shop familiar with Akrapovic systems is strongly recommended.

With valves closed the S-BM/T/32H produces a sound level close to stock, making it practical for daily driving and noise-restricted environments. With valves open the tone becomes significantly deeper and more aggressive, with a clear B58 inline-six character across the mid and upper rpm range.

The S-BM/T/32H integrates with the factory BMW active exhaust valve system rather than using Akrapovic's standalone sound kit. Valve control is managed through the factory driving modes and the OEM actuator rather than a separate Akrapovic controller.

Akrapovic covers the S-BM/T/32H with a 3-year manufacturer warranty against defects in materials and workmanship under normal street use conditions.

Installation Overview

1. Lift and safely support the vehicle on jack stands or a 4-post lift
2. Allow the factory exhaust to cool fully before beginning any work
3. Remove the factory rear muffler clamps and disconnect from the OEM rubber hangers
4. Lower and remove the OEM rear muffler assembly
5. Install the BMW OEM actuator 18 30 8 686 640 per BMW instructions if not already fitted
6. Slide the Akrapovic S-BM/T/32H muffler onto the factory center pipe connection
7. Connect valve actuator wiring harness to the OEM plug
8. Hang the muffler on the factory rubber isolators and check tip alignment in the rear bumper cutouts
9. Install and hand-tighten all Akrapovic clamps before final alignment check
10. Torque all clamps to specification, start the vehicle, and verify no exhaust leaks and correct valve operation across all drive modes

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.