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Cat-Back Evolution Exhaust for the 2025 Audi RS Q8 4.0-Liter Twin-Turbo V8
The Akrapovic S-AU/T/3H Evolution Race Line is a full cat-back titanium exhaust system engineered for the 2025 Audi RS Q8 (4M Facelift) with the 4.0-liter twin-turbo V8 and OPF particulate filter. Requiring the companion CO-AU/T/5 titanium link pipe set sold separately, the S-AU/T/3H delivers verified gains of +5.7 kW and +10.7 Nm over the factory RS Sport exhaust, sheds 12.2 kg of total system weight including the link pipe, and adds electronically controlled cast titanium exhaust valves that sync with the RS Q8 drive modes to provide a refined V8 rumble in Comfort and a full-bore racing bellow in Dynamic. The system is ECE type-approved for road use on OPF-equipped 2025 RS Q8 models.
Key Features
- Full Titanium Construction — Every component of the S-AU/T/3H, including the central muffler, valve housings, connecting pipes and tail pipes, is built from high-grade titanium for corrosion resistance, superior heat dissipation and minimum system weight.
- Electronic Cast Titanium Exhaust Valves — Akrapovic's in-house cast titanium valve housings integrate directly with the RS Q8 drive mode selector, delivering calibrated sound and backpressure adjustment across Comfort, Auto, Dynamic and RS-specific modes.
- +5.7 kW and +10.7 Nm Verified Gains — Akrapovic dynamometer testing against the factory RS Sport exhaust confirms +5.7 kW at 6,200 rpm and +10.7 Nm at 2,850 rpm on the stock 4.0-liter twin-turbo V8.
- 12.2 kg Total System Weight Reduction — Combined S-AU/T/3H and CO-AU/T/5 link pipe system saves approximately 12.2 kg at the rear of the vehicle versus the OEM exhaust assembly.
- X-Pipe Pulse Balancing — Connecting pipe set integrates an X-shaped insert to equalize exhaust pulses between cylinder banks, minimize flow turbulence and amplify the deep V8 rumble characteristic of the RS Q8 powerplant.
- CO-AU/T/5 Link Pipe Required — The titanium link pipe set CO-AU/T/5 is a mandatory companion for complete installation and optimal performance of the S-AU/T/3H system. It is sold separately.
- ECE Type-Approved — Certified for road use on OPF-equipped 2025 Audi RS Q8 models. No check-engine lights or ECU modification required.
This Part Fits
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2025 | Audi | RS Q8 | Performance |
Specifications
| Detail | Value |
|---|---|
| Brand | Akrapovic |
| MPN | S-AU/T/3H |
| UPC | 3831113613621 |
| System Type | Evolution Race Line, Cat-Back (Titanium) |
| Compatible Vehicle | 2025 Audi RS Q8 (4M Facelift) with OPF/GPF |
| Engine | 4.0L Twin-Turbo V8 |
| Material | Titanium (muffler, valves, pipes, tips) |
| System Weight (with link pipe) | approx. 25.8 kg + 4.5 kg (CO-AU/T/5) |
| Total Weight Savings | approx. 12.2 kg |
| Peak Power Gain | +5.7 kW at 6,200 rpm |
| Peak Torque Gain | +10.7 Nm at 2,850 rpm |
| Exhaust Valves | Electronic cast titanium, drive mode integrated |
| Tip Style | Dual carbon fiber and titanium outlets per side (quad exit) |
| Shipping Box Dimensions | 140 cm x 50 cm x 40 cm |
| Link Pipe Required | CO-AU/T/5 (sold separately) |
| Homologation | ECE type-approved (OPF models) |
| Country of Origin | Slovenia |
| Warranty | 24 months |
What's Included
- 1x Akrapovic S-AU/T/3H titanium central muffler
- 2x Akrapovic cast titanium valve housings with electronic actuators (one per side)
- Titanium connecting pipe set with integrated X-shaped pulse balancer
- 2x Dual carbon fiber and titanium exhaust tips (quad exit)
- All stainless steel clamps, brackets and gaskets
- Akrapovic installation manual
Frequently Asked Questions
Is the CO-AU/T/5 link pipe included with the S-AU/T/3H?No. The CO-AU/T/5 titanium link pipe set is required for complete installation but is sold separately. The S-AU/T/3H cannot be installed as a complete system without it.
Does the S-AU/T/3H require an ECU tune?No ECU reprogramming is required. The S-AU/T/3H is designed for direct bolt-on installation on the 2025 Audi RS Q8 with OPF filter. No check-engine lights or error codes result from proper installation.
Does the S-AU/T/3H work with the RS Q8 drive mode system?Yes. The electronic cast titanium exhaust valve actuators integrate with the RS Q8's standard drive modes, modulating exhaust sound and flow characteristics across Comfort, Auto, Dynamic and RS-specific settings.
What are the verified power gains of the S-AU/T/3H on the Audi RS Q8?Akrapovic dyno testing against the factory RS Sport exhaust confirms +5.7 kW at 6,200 rpm and +10.7 Nm at 2,850 rpm on the 4.0-liter twin-turbo V8 of the 2025 Audi RS Q8.
How much weight does the S-AU/T/3H and CO-AU/T/5 system save?The combined S-AU/T/3H and CO-AU/T/5 system reduces total exhaust weight by approximately 12.2 kg versus the OEM assembly, concentrated at the rear of the vehicle for improved handling balance.
Is the S-AU/T/3H compatible with the non-OPF Audi RS Q8?No. The S-AU/T/3H is engineered and ECE-approved specifically for OPF-equipped 2025 RS Q8 models. Installation on non-OPF variants requires additional modifications not covered by this system.
What do the exhaust tips look like on the S-AU/T/3H?The system features dual carbon fiber and titanium exhaust tips per side for a quad-exit arrangement. The tips extend aggressively from the rear bumper opening and are hand-finished for precision fitment.
Is the S-AU/T/3H street legal in the United States?The S-AU/T/3H is ECE type-approved for road use on OPF-equipped 2025 RS Q8 models. Verify compliance with applicable US federal and state noise and emissions regulations before installation.
Installation Instructions
- Order and receive the required CO-AU/T/5 link pipe set before beginning installation. The S-AU/T/3H cannot be installed without it.
- Allow the vehicle to cool completely. Exhaust system components reach extreme temperatures during operation.
- Raise and support the vehicle securely on a lift or jack stands to access the underside.
- Disconnect the factory exhaust valve actuator wiring connectors before removing the factory exhaust assembly.
- Loosen and remove all factory exhaust clamps, flange hardware and rubber hanger mounts. Retain OEM parts.
- Remove the factory rear muffler assembly from the vehicle.
- Install the CO-AU/T/5 titanium link pipe set onto the factory mid-pipe junction per the CO-AU/T/5 installation instructions.
- Attach the S-AU/T/3H titanium connecting pipe set with X-pipe insert to the CO-AU/T/5 output and secure with the provided Akrapovic clamps.
- Mount the cast titanium valve housings and central muffler in position and hang on factory rubber mounts.
- Connect the exhaust valve actuator wiring to the OEM connectors. Verify secure engagement.
- Install the carbon fiber and titanium tip set onto the valve housing outlets.
- Start the engine, cycle through all drive modes and inspect all connections for leaks. Retighten hardware as needed.
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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