Akrapovic 2021 BMW M8/M8 Competition (F91/F92) Evolution Line Cat Back (Titanium) w/Carbon Tips

The Akrapovic S-BM/T/23 Evolution Line Cat Back (Titanium) with Carbon Tips is built exclusively for the 2020 to 2024 BMW M8 and M8 Competition in both Coupe (F92) and Convertible (F91) body styles. Hand-crafted in Akrapovic's Slovenia manufacturing facility using aerospace-grade titanium, the S-BM/T/23 replaces the factory catback system from the catalytic converters back with a precision-engineered titanium assembly that delivers 8 kW (11 HP) at 5,450 rpm, 13 Nm (10 lb/ft) at 2,600 rpm, and a system weight of just 11.8 kg — a reduction of 10.6 kg (23.4 lbs) versus the 22.4 kg OEM system. ECE type-approved at 91 dB, the S-BM/T/23 satisfies European homologation requirements while producing the trademark Akrapovic sound: a refined, complex BMW S63 exhaust note that builds from a civilized idle into a layered, high-rpm crescendo that defines the M8 driving experience.

Fitment

Specifications

What's Included

• 2x Titanium muffler assemblies
• 4x Titanium link pipes
• 2x Carbon fiber dual exhaust tips
• Stainless steel clamps and bolts
• Complete mounting hardware kit
• Akrapovic installation instructions

Frequently Asked Questions

Yes. The S-BM/T/23 is engineered for both the F91 Convertible and F92 Coupe body styles with the 4.4L S63 twin-turbo V8, spanning all model years from 2020 through 2024.

The S-BM/T/23 fits the F91 M8 Convertible and F92 M8 Coupe two-door body styles. The S-BM/T/25 fits the F93 M8 Gran Coupe four-door body style. Both are Evolution Line titanium catback systems with carbon tips but are designed for different chassis geometries and cannot be interchanged.

Akrapovic's dyno testing confirms a gain of 8 kW (11 HP) at 5,450 rpm and 13 Nm (10 lb/ft) of torque at 2,600 rpm on a stock F91 or F92 M8 Competition with the 4.4L S63 engine and no other modifications.

No. The S-BM/T/23 is a direct bolt-on catback that retains the factory catalytic converters and all OEM sensors. No ECU recalibration or additional tuning is needed to realize the documented power gains.

No. The S-BM/T/23 is a catback system. All factory oxygen sensors and catalytic converters remain in their OEM positions, so no CEL conditions are created on a stock BMW M8 or M8 Competition.

Yes. The S-BM/T/23 integrates with the factory BMW active exhaust valve actuation wiring. The quiet and sport mode valve functionality controlled by the M Drive menu is retained after installation.

The S-BM/T/23 weighs 11.8 kg (26 lbs) versus the factory catback at 22.4 kg (49.4 lbs), removing 10.6 kg (23.4 lbs) from the rear of the M8 for improved weight distribution and rear dynamics.

Yes. The S-BM/T/23 is ECE type-approved at 91 dB, meeting European road-use noise homologation requirements. It is not CARB certified. California residents should confirm CARB compliance before purchase. All other US states: this is a street-legal exhaust system.

An experienced installer or professional technician can complete the S-BM/T/23 installation in approximately two to three hours. The system requires no cutting, welding, or chassis modification, but professional installation is recommended for correct clamp torque and valve connector alignment.

The S-BM/T/23 is backed by Akrapovic's lifetime warranty against manufacturing defects, covering all components for the life of the exhaust system.

Installation Instructions

1. Allow the vehicle to cool completely before beginning. The factory exhaust system holds significant heat after operation.
2. Raise and secure the BMW M8 F91 or F92 on a lift or properly rated jack stands with support at all four chassis jack points.
3. Unplug the factory active exhaust valve actuator connectors at both muffler assemblies and secure the wiring harness away from the work area.
4. Loosen and remove the factory exhaust clamps at the catalytic converter outlets on both sides of the vehicle.
5. Disconnect all factory muffler rubber hanger isolators along both sides and at the rear valance. Support the weight of the factory system before releasing the final hanger to prevent it from dropping.
6. Lower and remove the factory catback assembly. Inspect all rubber isolators for cracking or deformation and replace any worn isolators before installation.
7. Slide the Akrapovic titanium link pipes onto the catalytic converter outlets and align with the factory hanger positions. Attach supplied clamps hand-tight at this stage.
8. Connect the Akrapovic titanium rear link pipes and route into the OEM hanger positions on both sides. Clip all hangers into the rubber isolators.
9. Mount the Akrapovic titanium muffler assemblies to the rear link pipes and secure all rear hanger points. Fit the carbon fiber tips and tighten tip hardware to specification.
10. Reconnect the factory active exhaust valve actuator connectors to the Akrapovic muffler valve ports on both sides.
11. Confirm all clamps are fully engaged and the system is symmetrically aligned before applying final torque. Torque all clamps to the specifications listed in the included Akrapovic instruction sheet.
12. Lower the vehicle and start the engine. Run through a complete idle heat cycle for 10 to 15 minutes. After the system cools, re-inspect all joints and re-torque any clamps that have loosened during the first thermal 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.