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Single-Muffler Titanium Slip-On with Four Carbon Tips Built for the BMW Z4 M40i G29 B58 Engine
The Akrapovic S-BM/T/9H Slip-On Line is engineered specifically for the 2019 to 2024 BMW Z4 M40i (G29) with the B58B30C 3.0L inline-six. The system replaces the factory rear muffler section with a single titanium silencer housing four hand-crafted round carbon fiber exhaust tips, saving 6.1 kg versus the 16.7 kg OEM assembly. Dyno testing confirms power gains of +3 HP and +7.4 Nm at 2,400 rpm, with valve-controlled sound modes for both sporty and comfortable output. ECE type approval is valid for OPF-equipped G29 models; for non-OPF variants this system is intended for off-road or competition use. Note: installation requires cutting the factory exhaust system and cannot be reversed without replacement of the OEM muffler section. The optional Akrapovic Sound Kit enables wireless valve control but voids ECE type approval when installed.
Key Features
- Dyno-Proven Gains +3 HP and +7.4 Nm at 2,400 rpm on the G29 Z4 M40i with the B58B30C engine, providing noticeably improved throttle response from low and mid-range rpm
- 6.1 kg Weight Reduction System weighs 10.6 kg versus the 16.7 kg OEM rear muffler, improving rear weight balance on the G29 roadster platform
- Four Hand-Crafted Carbon Tips Included Four round carbon fiber exhaust tips are included in the box and provide a premium visual finish that is already integrated into the system design
- Titanium with Foundry Cast Components High-grade titanium construction with cast parts from Akrapovic's in-house foundry ensures precision fitment and structural integrity
- Valve-Controlled Sound Modes Sound varies between a refined, comfortable cruising note and a sporty, animated exhaust roar at higher rpm, ideal for open-top driving
- OPF ECE Approved (B58B30C) Holds ECE type approval for 2019 to 2024 Z4 M40i models equipped with the Otto Particulate Filter; non-OPF variants for off-road use only
- Optional Sound Kit Compatible Akrapovic Sound Kit sold separately provides wireless control over valve settings; note that installing the Sound Kit or Evolution Link Pipe voids ECE type approval
This Part Fits
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2019-2024 | BMW | Z4 | M40i |
Specifications
| Detail | Value |
|---|---|
| MPN | S-BM/T/9H |
| UPC | 3831113575881 |
| Brand | Akrapovic |
| System Type | Slip-On Line with four carbon fiber tips (included) |
| Primary Material | High-grade titanium with in-house cast components |
| System Weight | 10.6 kg |
| Weight Reduction | 6.1 kg vs. OEM (16.7 kg stock) |
| Power Gain | +3 HP at 2,400 rpm |
| Torque Gain | +7.4 Nm at 2,400 rpm |
| Pipe Diameter | 70mm |
| Compatible Engine | B58B30C 3.0L Inline-Six |
| ECE Approval | Valid for OPF-equipped G29 (B58B30C); non-OPF for off-road use only |
| Installation Note | Requires cutting the factory exhaust system |
| Country of Origin | Slovenia |
| Warranty | Akrapovic manufacturer warranty |
What's Included
- Akrapovic S-BM/T/9H titanium slip-on muffler (single muffler layout)
- Four hand-crafted round carbon fiber exhaust tips
- All mounting clamps and hardware
- Akrapovic installation instructions
- Akrapovic authenticity certificate
Frequently Asked Questions
Does the Akrapovic S-BM/T/9H fit the 2022 to 2024 BMW Z4 M40i G29 as well as the 2019?Yes. The S-BM/T/9H is confirmed for all model years 2019 to 2024 of the BMW Z4 M40i (G29) with the B58B30C engine. The G29 platform did not receive exhaust architecture changes across these years that would affect fitment.
Does installation really require cutting the stock exhaust?Yes. Unlike some slip-on systems that bolt on without modification, the S-BM/T/9H for the Z4 M40i requires cutting the factory exhaust system during installation. This is confirmed by Akrapovic's official installation instructions. Professional installation at an experienced exhaust or performance shop is strongly recommended given this requirement.
Are the carbon fiber tips included or sold separately?The four round carbon fiber tips are included with the S-BM/T/9H and are an integrated part of the system design. No separate tip purchase is required. The tips cannot be swapped for a different style without purchasing a separate tip set.
How much power does the S-BM/T/9H add to the Z4 M40i?Akrapovic's dyno results show a gain of +3 HP and +7.4 Nm at 2,400 rpm on the G29 Z4 M40i. These gains occur at mid-range rpm, where the B58's torque curve already peaks, making the improvement noticeable during daily driving and highway acceleration.
Is this system street-legal on the Z4 M40i?The S-BM/T/9H holds ECE type approval for BMW Z4 M40i G29 models equipped with the OPF (Otto Particulate Filter). For non-OPF equipped G29 variants, this system is intended for off-road or competition use only. Installing the optional Sound Kit or Evolution Link Pipe also voids the ECE type approval.
Does the S-BM/T/9H fit the Toyota Supra A90 as well?No, not directly. The S-BM/T/9H is fitment-specific to the BMW Z4 M40i G29. The Toyota Supra A90 uses a related but different part number (S-TY/T/1H) because despite sharing the B58 engine the rear exhaust routing and chassis architecture differ between the two vehicles. Akrapovic makes a dedicated Supra-specific system.
What sound modes are available with the S-BM/T/9H?The system features a valve-actuated design that delivers different sound profiles depending on driving mode. In comfort or lower throttle settings the sound is refined and non-intrusive for open-top cruising. Under harder acceleration the valves open to deliver a sportier, more animated tone from the B58 inline-six. The optional Akrapovic Sound Kit allows wireless override of the valve position.
What is the warranty on the Akrapovic S-BM/T/9H?The S-BM/T/9H is covered by the standard Akrapovic manufacturer warranty against defects in materials and workmanship. Contact Black Ops Auto Works for warranty registration details and full terms.
Installation Overview
- Lift the Z4 M40i safely and support on appropriate stands or a lift
- Allow the factory exhaust to cool completely before beginning
- Locate the cut point on the factory rear exhaust section per Akrapovic's installation instructions
- Cut the factory exhaust system at the marked position using appropriate cutting tools
- Remove the cut factory muffler section from the vehicle
- Clean and prepare the cut pipe end for clamp fitment
- Position the Akrapovic S-BM/T/9H and connect to the prepared factory pipe end
- Hang the muffler on the factory rubber hanger isolators
- Install Akrapovic clamps and torque to specification
- Verify alignment of the four carbon tips in the rear bumper opening and check for exhaust leaks at idle
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