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Race-Bred Aerodynamics for the BMW G80 M3 and G82 M4 Series
The Akrapovic DI-BM/CA/9/G Rear Carbon Fiber Diffuser in High Gloss is a precision-engineered aerodynamic upgrade purpose-built for the BMW M3 (G80), M3 Touring (G81), M4 Coupe (G82), and M4 Convertible (G83). Hand-laid from motorsport-grade carbon fiber and finished in a premium high gloss clear coat, the AKRDI-BM/CA/9/G replaces the factory plastic diffuser with a piece that mirrors the visual language of factory M Performance accessories while delivering measurable aerodynamic improvement. ABE type-approved for road use in Germany, this diffuser is a direct bolt-on fitment requiring no cutting, drilling, or permanent modification to your vehicle.
Key Features
- Genuine Akrapovic hand-laid motorsport-grade carbon fiber construction
- Premium high gloss UV-resistant clear coat finish for long-lasting depth and clarity
- Direct OEM bolt-on replacement, no cutting or drilling required
- ABE type-approved for road-legal fitment in Germany and throughout the EU
- Weighs approximately 1.7 kg for a meaningful reduction over the factory plastic unit
- Designed to complement the Akrapovic exhaust tail pipe sets (TP-CT/68, TP-CT/69) for a cohesive look
- Compatible with M3 Competition, Competition xDrive, CS, and M3 Touring; M4 Competition, Competition xDrive, CS, CSL, and M4 Convertible variants
- Prop 65 compliant warning included where required
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2021-2025 | BMW | M3 | Competition |
| 2021-2025 | BMW | M3 | Competition xDrive |
| 2023-2025 | BMW | M3 | CS |
| 2021-2025 | BMW | M3 Touring | Competition xDrive |
| 2021-2026 | BMW | M4 | Competition |
| 2021-2026 | BMW | M4 | Competition xDrive |
| 2025-2025 | BMW | M4 | CS |
| 2023-2023 | BMW | M4 | CSL |
| 2021-2026 | BMW | M4 Convertible | Competition xDrive |
Specifications
| Detail | Value |
|---|---|
| Part Number (MPN) | DI-BM/CA/9/G |
| Brand | Akrapovic |
| Material | High Gloss Carbon Fiber |
| Weight | Approx. 1.7 kg |
| Type Approval | ABE (Germany, road-legal) |
| Finish | High Gloss Clear Coat |
| Fitment Type | Direct OEM Replacement, Bolt-On |
| Compatible Vehicles | BMW M3 G80, M3 Touring G81, M4 G82, M4 Convertible G83 (2021-2026) |
| UPC | 3831126403287 |
| Country of Origin | Slovenia |
| Manufacturer | Akrapovic d.d. |
What's Included
- 1x Akrapovic DI-BM/CA/9/G Rear Carbon Fiber Diffuser (High Gloss)
- Mounting hardware and fasteners
- Akrapovic installation instructions
Frequently Asked Questions
Does the AKRDI-BM/CA/9/G fit the BMW M3 Competition xDrive G80?Yes. The DI-BM/CA/9/G is designed for all M3 G80 variants including the Competition and Competition xDrive models from 2021 through 2025. It is a direct bolt-on replacement for the factory rear diffuser and requires no modification to the bumper or chassis.
Will this diffuser fit the BMW M4 Convertible G83?Yes. The Akrapovic DI-BM/CA/9/G fits the M4 Convertible G83 in Competition xDrive trim from 2021 through 2026. The diffuser shares the same rear bumper architecture across the G82 Coupe and G83 Convertible body styles.
Is the AKRDI-BM/CA/9/G street legal?Yes. This diffuser carries ABE type approval, which is the German federal certification for road-legal aftermarket parts. ABE approval is recognized throughout the European Union, and the part is sold and registered as a legal road-use component in numerous markets. It does not affect any exhaust or emissions certification on the vehicle.
What is the difference between the DI-BM/CA/9/G High Gloss and the DI-BM/CA/9/GB High Gloss Black?The DI-BM/CA/9/G features a natural high gloss carbon weave finish that showcases the traditional look of the carbon fiber. The DI-BM/CA/9/GB is finished in a gloss black tinted clear coat, which darkens the weave for a more subtle, monochromatic appearance. Both share identical construction quality, fitment, and ABE type approval.
Does the DI-BM/CA/9/G fit the BMW M3 CS or M4 CSL?Yes. The DI-BM/CA/9/G is confirmed fitment for the 2023-2025 M3 CS (G80) and the 2023 M4 CSL (G82). Note that the M3 CS and M4 CSL use the same rear bumper architecture as the standard M3 Competition and M4 Competition, making the diffuser a compatible direct replacement.
Does this diffuser pair with the Akrapovic exhaust for a full system look?Yes. Akrapovic designed the DI-BM/CA/9/G to visually complement the Slip-On Line Titanium exhaust system fitted with the octagonal carbon tail pipe set (TP-CT/69) or the round carbon tail pipe set. Together they create a cohesive, motorsport-inspired rear end presentation that is entirely road-legal with ABE approval.
How does the Akrapovic carbon diffuser compare to the OEM M Performance diffuser?The OEM BMW M Performance diffuser is also made of carbon fiber, but the Akrapovic DI-BM/CA/9/G offers a notably lighter weight due to Akrapovic's motorsport-derived layering process and their in-house craftsmanship from their Slovenian facility. The Akrapovic piece also carries ABE type approval independently, meaning it meets the same road-legal standard. Many owners choose the Akrapovic version for its deeper gloss finish and exhaust tail pipe compatibility.
What maintenance does the high gloss carbon finish require?The high gloss UV-resistant clear coat on the DI-BM/CA/9/G is durable under normal road use. Akrapovic recommends periodic hand washing with a pH-neutral car shampoo and the use of a quality carnauba or ceramic spray wax to maintain the gloss finish. Avoid automatic car washes with abrasive brushes, and do not use solvent-based cleaners directly on the carbon surface. Periodic inspection of the mounting hardware is also recommended, particularly after track use.
Can the AKRDI-BM/CA/9/G be installed without professional help?Installation is within reach for an enthusiast with basic mechanical aptitude. The diffuser bolts directly to existing OEM mounting points, and no cutting, drilling, or adhesive bonding is required. Akrapovic includes all necessary hardware. That said, a professional alignment check after installation ensures the diffuser sits flush and symmetrical with the bumper, which is especially important for a showroom-quality appearance.
Installation Instructions
- Raise and safely support the rear of the vehicle on a lift or jack stands with the parking brake engaged.
- Remove the OEM rear diffuser by locating and unclipping all factory push-pin retainers along the bottom edge and sides of the bumper.
- Disconnect any retaining tabs or clips securing the factory diffuser to the bumper lower section and carefully separate it from the bumper skin.
- Clean all mounting surfaces to remove any dirt or debris before fitment of the new diffuser.
- Position the Akrapovic DI-BM/CA/9/G carbon diffuser against the rear bumper and align all mounting points with the corresponding OEM locations.
- Insert and hand-tighten all supplied fasteners and hardware to ensure the diffuser is correctly seated before final torque.
- Torque all fasteners to the specification provided in the Akrapovic installation sheet included with the part.
- Lower the vehicle and perform a visual inspection from directly behind to confirm equal gap and flush alignment on both sides.
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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