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Unleash the S68 V8: Akrapovic S-BM/T/38 Evolution Line Titanium Cat-Back for G90/G99 BMW M5
The Akrapovic S-BM/T/38 Evolution Line Titanium Cat-Back exhaust system for the 2025 and 2026 BMW M5 G90 Sedan and G99 Touring unlocks a dramatically improved exhaust note from the S68 4.4L twin-turbo V8, while shedding 6.1 kg from the car's rear mass. Engineered by Akrapovic to be a street-legal, plug-and-play installation requiring no ECU remapping, this system adds 5.2 kW of peak power and 24.3 Nm of peak torque at 2,050 rpm. Optional acoustic reflectors direct more exhaust sound into the cabin, and the S-BM/T/38 is compatible with Akrapovic's Sound Kit for valve control. Tips not included carbon fiber hex or cylindrical tips are sold separately. Note: installation requires cutting the factory exhaust system.
Key Features
- Titanium Evolution Line cat-back for 2025-2026 BMW M5 G90 Sedan and G99 Touring (S-BM/T/38)
- Weight savings of 6.1 kg (13.4 lbs) versus factory exhaust, approximately 32% mass reduction
- Measured dyno gain of 5.2 kW (7.1 hp) and 24.3 Nm (17.9 lb-ft) at 2,050 rpm
- Plug-and-play street-legal installation with no ECU remap required
- Optional acoustic reflectors direct exhaust sound toward the cabin for an enhanced in-car soundtrack
- Compatible with Akrapovic Sound Kit for in-cabin valve actuator control
- Grade-1 titanium construction with precision TIG welds to aerospace tolerances
- Street-legal design retaining factory catalyst and OPF/GPF filter hardware
- Carbon fiber hex or cylindrical tips sold separately in multiple finish options
- Installation requires cutting the OEM exhaust system (approximately 4 hours shop time)
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2025-2026 | BMW | M5 | xDrive |
| 2025-2026 | BMW | M5 Touring | xDrive |
Specifications
| Detail | Value |
|---|---|
| Part Number (MPN) | S-BM/T/38 |
| System Type | Evolution Line Cat-Back |
| Material | Grade-1 Titanium |
| Weight Savings | 6.1 kg (13.4 lbs), approximately 32% |
| Peak Power Gain | +5.2 kW (+7.1 hp) |
| Peak Torque Gain | +24.3 Nm (+17.9 lb-ft) at 2,050 rpm |
| Compatible Engine | 4.4L Twin-Turbo V8 (S68) |
| BMW Platform | G90 (M5 Sedan) / G99 (M5 Touring) |
| Tips Included | No (carbon fiber hex or cylindrical tips sold separately) |
| ECU Remap Required | No (plug-and-play) |
| Installation Note | Requires cutting OEM exhaust system |
| Sound Kit Compatible | Yes |
| Brand | Akrapovic |
| Country of Manufacture | Slovenia |
| UPC | 3831126445027 |
What's Included
- Akrapovic S-BM/T/38 titanium Evolution Line cat-back exhaust system
- All required mounting hardware and clamps
- Akrapovic installation instructions
- Note: exhaust tips are NOT included and must be purchased separately
Frequently Asked Questions
Which BMW M5 models does the Akrapovic S-BM/T/38 fit?
The S-BM/T/38 fits the 2025 and 2026 BMW M5 G90 Sedan and the 2025 and 2026 BMW M5 G99 Touring, both powered by the S68 4.4L twin-turbo V8 with xDrive all-wheel drive. It does not fit the previous-generation F90 M5.
Does the S-BM/T/38 require an ECU remap after installation?
No. Akrapovic engineered the S-BM/T/38 as a plug-and-play system with no ECU remapping required. The dyno-measured gains of 5.2 kW and 24.3 Nm are achieved without any software modification to the BMW M5's engine management.
Why does installation require cutting the OEM exhaust?
The BMW M5 G90/G99's factory exhaust routing does not include a traditional slip-joint or clamp connection at the rear section that would allow a clean bolt-on removal. Akrapovic's installation procedure requires cutting through the OEM exhaust at a specific location, which is then replaced by the titanium system. This is a professional shop operation and is not reversible once performed.
What exhaust tips are compatible with the S-BM/T/38?
Akrapovic offers carbon fiber exhaust tips in both hexagonal and cylindrical profiles for the BMW M5 G90/G99 to pair with the S-BM/T/38. These tips incorporate acoustic reflectors that redirect some of the exhaust sound toward the cabin, enhancing the in-car driving experience. Tips must be purchased separately from the cat-back system.
What is the Akrapovic Sound Kit and is it compatible with the S-BM/T/38?
Yes, the S-BM/T/38 is compatible with Akrapovic's Sound Kit, which allows the driver to independently control the exhaust valve actuators from inside the cabin, opening or closing the valves to switch between a quieter mode and a fully open, maximum-volume mode regardless of the M5's drive mode selection.
How does the S-BM/T/38 affect the M5 Touring (G99) differently from the G90 Sedan?
The S-BM/T/38 is confirmed to fit both the G90 Sedan and the G99 Touring as the two share the same exhaust routing and connection architecture under the vehicle. Weight savings, power gains, and sound characteristics are effectively identical across both body styles. The G99 carbon fiber trunk spoiler offered separately by Akrapovic is specific to the sedan only.
How much weight does the S-BM/T/38 save on the BMW M5?
The Akrapovic S-BM/T/38 removes 6.1 kg (13.4 lbs) of exhaust mass from the BMW M5, representing approximately 32% of the factory exhaust system weight. This reduction in unsprung and rear-mounted mass has a measurable effect on the M5's dynamic balance and acceleration performance beyond the direct power gain alone.
Will the S-BM/T/38 affect the BMW M5's factory warranty?
Aftermarket exhaust systems, particularly those requiring cutting of the OEM exhaust, may affect BMW's powertrain warranty coverage for related components. Dealer interpretation varies. We recommend consulting your BMW M dealer before installation to understand potential warranty implications in your specific situation.
Is the Akrapovic S-BM/T/38 legal to use on public roads in California?
The S-BM/T/38 carries a Non-CARB designation, which means it is not approved for use on public roads in California or other states that have adopted CARB emissions standards. Buyers in California or CARB states should confirm compliance with local regulations before purchasing.
Installation Overview
- Allow the factory exhaust system to cool completely before beginning work.
- Raise and securely support the M5 on a professional lift or appropriately rated jack stands with wheels chocked.
- Apply penetrating lubricant to all OEM exhaust hangers and mounting hardware.
- Using the cutting location specified in the Akrapovic installation instructions, cut through the OEM exhaust at the designated point. This step is irreversible — confirm the cut location precisely before proceeding.
- Release all factory rubber exhaust hangers and remove the factory cat-back section from the vehicle.
- Clean all connection surfaces and prepare for the Akrapovic system installation.
- Install the Akrapovic S-BM/T/38 titanium cat-back system, connecting to the OEM mid-pipe at the cut location using the supplied clamping hardware.
- Route all rubber hangers onto their mounting pegs, ensuring no contact with chassis, suspension, or body components.
- Install the separately purchased Akrapovic carbon fiber tip assemblies per their included instructions before final torque.
- Torque all connection hardware to the specifications provided in the Akrapovic installation sheet.
- Start the engine and check all joints for exhaust leaks. Re-torque after the first full heat cycle once the system has cooled.
- If installing the optional Sound Kit, complete the valve actuator wiring per the Sound Kit instructions before final inspection.
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.
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