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Titanium Evolution Line Authority: Akrapovic S-AU/TI/28H for the 2025 Audi RS3 Sedan 8Y FL
The Akrapovic S-AU/TI/28H Evolution Line cat-back exhaust system in titanium is the definitive performance exhaust upgrade for the 2025 Audi RS3 Sedan on the facelifted 8Y FL platform. Built from grade-1 titanium throughout, the S-AU/TI/28H delivers a dramatic reduction in exhaust system weight and transforms the 2.5 TFSI five-cylinder's signature sound into a fully developed, purposeful performance note. Developed alongside Akrapovic's P-HF1636 control kit (required separately) for seamless integration with the RS3's electronic exhaust valve system, this system is the choice for RS3 owners demanding genuine motorsport heritage in a street-legal package.
Key Features
- Evolution Line cat-back exhaust for the 2025 Audi RS3 Sedan 8Y FL with 2.5 TFSI engine
- Full grade-1 titanium construction for maximum weight reduction over the factory stainless system
- Engineered to work with the RS3's electronic exhaust valve system via the P-HF1636 control kit (sold separately)
- Preserves all four exhaust exits for the RS3's signature quad-tip visual identity
- Amplifies the 2.5 TFSI inline-five's distinctive five-cylinder exhaust character
- Precision TIG-welded titanium joints manufactured to Akrapovic aerospace tolerances
- Maintains compatibility with the RS3 Sedan 8Y FL's OPF/GPF emissions hardware
- Developed on Akrapovic's motorsport-derived test program for real-world performance durability
- Genuine Akrapovic product made in Slovenia — not an imitation or pattern part
- Direct fitment to the 2025 Audi RS3 Sedan 8Y FL platform with no cutting or modification required
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2025 | Audi | RS3 | Sedan |
Specifications
| Detail | Value |
|---|---|
| Part Number (MPN) | S-AU/TI/28H |
| System Type | Evolution Line Cat-Back |
| Material | Grade-1 Titanium |
| Vehicle Platform | Audi RS3 Sedan 8Y FL (2025+) |
| Engine | 2.5 TFSI Inline-5 |
| Control Kit Required | Yes (P-HF1636, sold separately) |
| Emissions Hardware | OPF/GPF compatible |
| Country of Manufacture | Slovenia |
| Brand | Akrapovic |
| UPC | 3831126444563 |
What's Included
- Akrapovic S-AU/TI/28H titanium Evolution Line cat-back exhaust system
- All required hardware, clamps, and gaskets for installation
- Akrapovic installation instructions
- Note: P-HF1636 electronic control kit is required and sold separately
Frequently Asked Questions
What is the P-HF1636 control kit and is it required?The P-HF1636 is Akrapovic's electronic interface kit for the 2025 Audi RS3 Sedan 8Y FL. It allows the S-AU/TI/28H to communicate with the RS3's factory electronic exhaust valve control system so that the Sport and RS Performance driving mode exhaust valve behaviors function correctly after installation. The kit is sold separately and is required for proper function of the valve-controlled sound modes.
Which 2025 Audi RS3 Sedan models does the S-AU/TI/28H fit?The S-AU/TI/28H is designed for the 2025 Audi RS3 Sedan on the facelifted 8Y FL platform with the 2.5 TFSI five-cylinder engine. It is not compatible with earlier 8Y pre-facelift RS3 models, the RS3 Sportback, or the Audi S3. Verify your RS3 Sedan is the 8Y FL (facelift) variant before ordering.
Is this a cat-back or a full system?The S-AU/TI/28H is a cat-back system, meaning it replaces the exhaust from the catalytic converter rearward. It retains the RS3's factory catalytic converter and OPF/GPF gasoline particulate filter, preserving emissions hardware while delivering the full Akrapovic exhaust note and weight reduction benefit.
How much weight does the S-AU/TI/28H save compared to the factory exhaust?Akrapovic's titanium Evolution Line systems typically reduce exhaust system weight by 40 to 60 percent compared to the factory stainless steel unit on comparable platforms. The specific weight saving for the 8Y FL RS3 is confirmed in Akrapovic's official product documentation available on their website. Grade-1 titanium's density advantage over stainless is the primary driver of this reduction.
Does the S-AU/TI/28H affect the 2025 RS3's warranty?Aftermarket exhaust modifications may affect the manufacturer warranty on emission-related components. Akrapovic's systems are engineered to maintain factory emissions hardware, which limits the scope of any warranty impact, but we recommend confirming with your Audi dealer before purchase if warranty preservation is a priority for you.
Will the RS3's sport exhaust sound modes still work with the S-AU/TI/28H installed?Yes, provided the P-HF1636 control kit is installed alongside the S-AU/TI/28H. The control kit preserves the RS3's electronic exhaust valve operation so that the individual driving modes continue to adjust exhaust valve position and sound character as intended by the RS3's factory programming.
Is the S-AU/TI/28H street legal in the United States?The S-AU/TI/28H retains the factory catalytic converter and GPF and is not a decat system, making it street legal in most US states. It does not carry a CARB Executive Order (EO) number. Buyers in California and other CARB-regulated states should confirm local emissions compliance requirements before purchase.
What does the Akrapovic titanium sound like on the RS3 inline-five?The Akrapovic S-AU/TI/28H amplifies the RS3's iconic 2.5 TFSI inline-five exhaust character with a more pronounced, layered sound across the rev range. The five-cylinder firing order creates a distinctive burble at idle and a howl under acceleration that the titanium construction enhances with sharper harmonic resonance compared to the factory stainless unit. The result is aggressive and mechanical without being droning at highway speeds.
How does the S-AU/TI/28H differ from a slip-on system?A slip-on system replaces only the muffler section at the tail of the exhaust. The S-AU/TI/28H Evolution Line is a full cat-back system, replacing all exhaust sections from the catalyst rearward including the center section and muffler assembly. This provides greater weight reduction and more comprehensive sound tuning than a slip-on upgrade delivers.
Installation Overview
- Confirm you have the P-HF1636 control kit in hand before beginning installation.
- Allow the factory exhaust to cool fully before starting any work.
- Raise and securely support the RS3 on a lift or rated jack stands with wheels chocked.
- Apply penetrating lubricant to all OEM exhaust flange hardware and rubber hangers and allow 15 minutes of soak time.
- Disconnect the factory exhaust at the catalytic converter outlet flange.
- Release all rubber hangers working rearward and lower the factory cat-back assembly.
- Install the Akrapovic S-AU/TI/28H assembly section by section per the Akrapovic installation sheet, connecting at the catalyst outlet flange first.
- Hang all rubber hangers and verify the system has clearance from all chassis, suspension, and body components.
- Hand-tighten all hardware, then torque to the specifications in the Akrapovic installation documentation.
- Install the P-HF1636 control kit per its separate installation instructions to restore exhaust valve control.
- 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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