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The Akrapovic M-BM/T/4H Slip-On Line (Titanium) is a premium, fully titanium exhaust system engineered for the 2011-2012 BMW 1 Series M Coupe (E82). Using a single muffler modular design, the M-BM/T/4H delivers a deeper, richer exhaust tone without drone in its standard configuration. It can be upgraded by replacing the internal blocking plate with the optional Akrapovic Sound Kit (P-HF878) for on-demand valve-controlled volume. It produces +3.5 kW at 5,670 rpm, +4.6 Nm of torque, and reduces weight by 1.2 kg versus the factory exhaust. Tail pipes are required separately (TP-CT/5 carbon or titanium equivalent).
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2011-2012 | BMW | 1 Series M | M Coupe |
Specifications
| Detail | Value |
|---|---|
| Part Number (MPN) | M-BM/T/4H |
| Brand | Akrapovic |
| System Type | Slip-On Line |
| Material | Titanium |
| Power Gain | +3.5 kW at 5,670 rpm |
| Torque Gain | +4.6 Nm at 3,100 rpm |
| Weight Savings | 1.2 kg / 10.1% vs. stock |
| Tail Pipes | Required separately: TP-CT/5 (Carbon) or titanium set |
| Optional Upgrade | Akrapovic Sound Kit P-HF878 for valve control |
| ECE Compliance | ECE type-approved for road use |
| Compatible Vehicles | 2011-2012 BMW 1 Series M Coupe (E82) |
| Country of Origin | Slovenia |
| UPC | N/A |
What's Included
- 1x Akrapovic M-BM/T/4H Slip-On Line Muffler (Titanium)
- All required mounting hardware and gaskets
- Installation instructions
- Tail pipes NOT included; must be purchased separately
Frequently Asked Questions
Does the M-BM/T/4H include tail pipes?No. The M-BM/T/4H requires a separate tail pipe set. Akrapovic recommends the Carbon Tail Pipe Set TP-CT/5, which is engineered specifically for this application and fits within the 1M Coupe's rear diffuser. Titanium tail pipe options are also available separately.
What is the optional Akrapovic Sound Kit and how does it work?The optional Akrapovic Sound Kit (P-HF878) replaces the internal blocking plate in the M-BM/T/4H muffler. Once installed, it enables valve-controlled exhaust volume switching via a remote or in-car integration. In the default position, exhaust flows through the muffler for a deep, refined tone. When the valve opens, exhaust is redirected through bypass outlets for a significantly louder, more aggressive character.
What power gains does the M-BM/T/4H deliver?Akrapovic dynamometer testing confirms gains of +3.5 kW at 5,670 rpm and +4.6 Nm of torque at 3,100 rpm versus the factory exhaust on the BMW 1 Series M Coupe E82.
Is the M-BM/T/4H road legal?Yes. The M-BM/T/4H holds ECE type-approval for road use in ECE-compliant markets. In the United States, it is not CARB certified but is generally suitable for non-California street use.
How much weight does the M-BM/T/4H save?The M-BM/T/4H saves 1.2 kg (2.6 lbs) versus the factory exhaust, a 10.1% weight reduction that reduces rear unsprung weight and contributes to improved agility.
Will the M-BM/T/4H drone at highway speeds?No. The M-BM/T/4H's single muffler design is specifically engineered to deliver a deeper, more resonant exhaust character without the interior resonance or drone that characterizes many aftermarket exhaust systems.
Can I use the M-BM/T/4H on an otherwise stock 1M Coupe?Yes. The M-BM/T/4H is designed to deliver power and weight gains and an improved exhaust note even when installed on an otherwise fully stock 2011-2012 BMW 1 Series M Coupe. No other exhaust modifications are required.
What tail pipe options are available for the M-BM/T/4H?Akrapovic offers the Carbon Tail Pipe Set TP-CT/5 as the primary companion for the M-BM/T/4H, featuring four carbon fiber tips designed to fit the 1M Coupe's rear diffuser. A titanium tail pipe set is also available for a more traditional look.
Is the M-BM/T/4H compatible with the factory valve system?Yes. The M-BM/T/4H is compatible with the optional Akrapovic Sound Kit (P-HF878), which provides a driver-controlled valve system. The system retains the straightforward, drone-free character when the valve is closed, and a substantially louder, more aggressive note when opened.
Does the Akrapovic M-BM/T/4H come with a warranty?Akrapovic exhaust systems are backed by the manufacturer's limited warranty for defects in materials and workmanship when installed and used as specified. Contact Black Ops Auto Works for full warranty terms and regional coverage details.
Installation Overview
- Safely lift and support the vehicle; allow the exhaust to cool completely before beginning
- Remove the factory muffler from the 1M Coupe's exhaust system per Akrapovic instructions
- Dry-fit the M-BM/T/4H to confirm positioning and hanger alignment
- Install all supplied gaskets and fasteners, tightening to Akrapovic specifications
- Install tail pipe set (TP-CT/5 or equivalent) per Akrapovic instructions
- If upgrading with Sound Kit (P-HF878), replace the blocking plate with the valve system now
- Torque all clamps and flanges evenly
- Lower the vehicle, start the engine, and inspect for leaks before road use
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