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No-Tips, All Titanium: Akrapovic S-BM/TI/33H Slip-On Line for 2021+ BMW M3 G80 and M4 G82
The Akrapovic S-BM/TI/33H Slip-On Line in titanium is the factory-proven exhaust upgrade for the 2021-and-later BMW M3 G80 and M4 G82 platform, covering Competition, Competition xDrive, CS, CSL, and Touring variants. Sold without tips so owners can pair it with their preferred Akrapovic titanium or carbon fiber tip set, the S-BM/TI/33H delivers a significant reduction in exhaust system weight and transforms the S58 twin-turbo straight-six's exhaust note into a sharper, more aggressive sound. Precision TIG-welded grade-1 titanium throughout, this is the definitive first step in the BMW G80/G82 Akrapovic exhaust system lineup and a direct bolt-on replacement for the factory muffler assembly.
Key Features
- Slip-On Line titanium muffler for 2021+ BMW M3 G80 and M4 G82 with S58 twin-turbo straight-six
- Covers M3, M3 Competition, M3 Competition xDrive, M3 CS, M3 Touring, M4, M4 Competition, M4 Competition xDrive, M4 CS, and M4 CSL variants
- Sold without tips choose Akrapovic titanium or carbon fiber tip set separately for desired appearance
- Grade-1 titanium construction for substantial weight savings over the factory stainless exhaust
- Transforms the S58 straight-six's exhaust character with deeper, more distinct Akrapovic sound
- Precision TIG-welded titanium joints to Akrapovic motorsport manufacturing standards
- Direct bolt-on fitment to the G80/G82 M-chassis link pipe and hanger system
- Compatible with the M3/M4's factory active exhaust valve system and its driving mode programs
- Genuine Akrapovic product manufactured in Slovenia
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2021-2025 | BMW | M3 | Competition |
| 2022-2025 | BMW | M3 | Competition xDrive |
| 2024 | BMW | M3 | CS |
| 2021-2026 | BMW | M4 | Competition |
| 2021-2026 | BMW | M4 | Competition xDrive |
| 2025 | BMW | M4 | CS |
| 2023 | BMW | M4 | CSL |
Specifications
| Detail | Value |
|---|---|
| Part Number (MPN) | S-BM/TI/33H |
| System Type | Slip-On Line (Muffler Replacement) |
| Material | Grade-1 Titanium |
| Tips Included | No (sold separately) |
| BMW Platform | G80 (M3) / G82 (M4) 2021+ |
| Engine | S58 3.0L Twin-Turbo Inline-6 |
| Active Exhaust Compatible | Yes |
| Brand | Akrapovic |
| Country of Manufacture | Slovenia |
| UPC | 3831126422110 |
What's Included
- Akrapovic S-BM/TI/33H titanium Slip-On Line muffler assembly
- All required mounting hardware and clamps
- Akrapovic installation instructions
- Note: Exhaust tips are NOT included and must be purchased separately
Frequently Asked Questions
Why does the S-BM/TI/33H not include exhaust tips?
Akrapovic designed the S-BM/TI/33H as a tip-agnostic muffler system so G80/G82 owners can choose their preferred tip style independently. The available options include titanium tips (TP-CT/69, TP-CT/68) and carbon fiber tips (TP-CT/73/CF). This approach lets each owner personalize the look of the exhaust without being locked into a single tip configuration at purchase.
Which BMW M3 and M4 G80/G82 variants does the S-BM/TI/33H fit?
The S-BM/TI/33H fits the 2021 and later BMW M3 Competition, M3 Competition xDrive, M3 CS, M3 Touring G81, M4 Competition, M4 Competition xDrive, M4 CS, and M4 CSL on the G80/G82/G83 platform. It is not compatible with the standard M3 or M4 without the Competition package, or with the older F80/F82 generation.
Does the S-BM/TI/33H work with the M3/M4's active exhaust system?
Yes. The S-BM/TI/33H interfaces with the G80/G82 factory active exhaust valve system. The electronic valve and the Sport, Sport Plus, and Comfort mode exhaust behaviors continue to function normally after installation, with the Akrapovic titanium construction amplifying the character of each mode.
How much weight does the S-BM/TI/33H save over the OEM BMW exhaust?
Akrapovic's titanium Slip-On Line systems deliver substantial weight reductions compared to the factory stainless steel muffler assemblies. For the G80/G82 platform, Akrapovic's published technical data specifies the weight saving. Grade-1 titanium's lower density is the primary driver, reducing unsprung rear-end mass and contributing to improved handling balance.
Is the S-BM/TI/33H street legal in the United States?
The S-BM/TI/33H retains the factory catalytic converter and is not a decat system, making it street legal in most US states. It does not carry a CARB Executive Order number, so buyers in California and other CARB-regulated states should confirm local emissions compliance before purchase.
Can the S-BM/TI/33H be installed on an M4 Convertible G83?
Yes, Akrapovic confirms the S-BM/TI/33H fits the M4 Convertible G83 platform alongside the coupe and Competition xDrive variants, as the exhaust system architecture under the G82/G83 body styles is shared.
What sound difference can be expected with the S-BM/TI/33H on the S58?
The S-BM/TI/33H amplifies the S58 straight-six's naturally aggressive character with a more prominent exhaust note at idle and a sharper, louder sound under hard acceleration. The titanium construction produces a higher-frequency harmonic character compared to the factory stainless, with improved resonance in Sport and Sport Plus modes through the active exhaust valve system.
Does the S-BM/TI/33H fit the M3 Touring G81?
Yes. Akrapovic confirms the S-BM/TI/33H fits the BMW M3 Touring G81 variant, which shares the same exhaust architecture as the G80 sedan. The system is a direct bolt-on for the G81 platform.
Installation Overview
- Confirm your preferred Akrapovic tip set is on hand before beginning — the system arrives without tips.
- Allow the factory exhaust to cool completely before starting any work.
- Raise and securely support the BMW on a lift or rated jack stands with wheels chocked.
- Apply penetrating lubricant to all OEM muffler mounting hardware and rubber hangers and allow a 15-minute soak.
- Disconnect the factory muffler at the link pipe junction clamp or flange.
- Release all rubber hangers and lower the OEM muffler assembly carefully.
- Position the S-BM/TI/33H assembly and connect to the link pipe junction, hand-tightening only at this stage.
- Hang all rubber hangers and verify the system clears all chassis and body components.
- Install your chosen Akrapovic tip set per the tip installation instructions.
- Torque all fasteners to the specification in the Akrapovic installation documentation.
- Start the vehicle and check all joints for exhaust leaks. Re-torque after the first full heat cycle.
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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