2021–2025 Audi A4 / A5 45 TFSI Stage 1 ECU Tune (B9.5 Hybrid EA888)
Boost Dynamic Tuning • OBDII Remote Flash

Exclusive USA-Based Calibration for the B9.5 Hybrid 2.0T Platform

If you own a 2021–2025 Audi A4 or A5 45 TFSI (B9.5 Hybrid EA888 Gen 3 2.0T), you’re sitting on untapped power. This hybrid ECU strategy is different from earlier EA888 setups, and most tuners still don’t have a working solution. Boost Dynamic Tuning is currently the only USA-based tuner offering a tested, proven Stage 1 calibration for this platform.

With 11+ years of in-house calibration experience, every file is built from scratch and validated through real-world logging and dyno sessions — no theoretical numbers, no resold maps, no gimmicks. Just clean, repeatable power and OEM+ drivability.

Why Choose BDT?

• Exclusivity: The only USA-based Stage 1 solution proven on the B9.5 hybrid platform.
• Authenticity: 100% in-house development — no resellers, no copy/paste maps.
• Transparency: Dyno-backed results and real-world testing.
• Remote Convenience: Flash from home via OBDII — no shop visit required.

This isn’t just tuning — it’s engineering with passion, built for drivers who demand more from their Audi.

Fitment & Compatibility

• Models: Audi A4 45 TFSI / Audi A5 45 TFSI
• Years: 2021, 2022, 2023, 2024, 2025
• Chassis: B9.5
• Engine: Hybrid EA888 Gen 3 2.0T
• Fuel: 91 or 93 Octane Pump Gas
• Tuning Method: Remote OBDII Flash (At-Home)
• Hardware Required: None

Stage 1 Power Gains (Pump Gas)

Unleash up to 283 WHP / 300 WTQ on pump gas with refined boost control, torque management, and throttle response.

BDT Stage 1 Highlights

• Optimized boost and torque delivery for smoother, harder pulls
• Intake Air Temp Safety alert (dash warning when pushing too hard)
• Speed limiter removed
• Torque limiters raised
• Raised rev limiter (Neutral/Park)
• Load limits raised
• Auto Start/Stop defaults OFF (still functional)
• Crackle/Overrun in Dynamic mode only
• Calibrated stock boost gauge for higher readings
• Sharper throttle response & reduced turbo lag
• Increased LPFP & HPFP pressure
• VVT recalibration
• Flashable via OBDII — no physical mods required

ECU Tune Modification Requirements

Remote Flash from Home (OBDII)

No shop visit. No downtime. Flash your ECU at home through the OBDII port — and BDT provides guided remote support every step of the way.

Remote Tuning How-To

Built for the Streets. Proven on the Dyno.

Whether you're carving through backroads or making a statement at your next meet, this Stage 1 tune gives your Audi the edge — with the refinement you expect from a luxury performance build.

Stop leaving power on the table. Elevate your driving experience with BDT’s Stage 1 calibration for the 2021–2025 Audi A4/A5 45 TFSI B9.5 Hybrid.

Dyno Session Live

Customer Reviews + Live Phone Chat

Maintenance Schedule (Required for Tuned Vehicles)

IF YOU WANT YOUR CAR TO SURVIVE, THESE MUST BE DONE!

I want your car to survive multiple years with my tune. This isn’t a “nice to have” list — it’s what I’ve seen work over years of tuning MQB/EA888 cars. If you can’t afford the maintenance, please don’t tune the car. This is how you keep it reliable.

EMISSIONS COMPLIANCE NOTICE & LEGAL DISCLAIMER

FOR COMPETITION USE ONLY — NOT FOR STREET USE

This product is sold and intended solely for vehicles used in closed-course racing, off-road competition, or organized motorsport events. It is not legal for use on any pollution-controlled vehicle operated on public roads or highways, as defined under the Clean Air Act (42 U.S.C. § 7522) and applicable state emissions laws.

By purchasing, installing, or using this product, you explicitly acknowledge and agree to the following terms:

Federal and State Emissions Compliance

• This product may modify, bypass, defeat, or render inoperative one or more emissions control devices, including but not limited to: catalytic converters, oxygen sensors, EGR systems, or OBD monitoring systems.
• The installation or use of this product on any vehicle subject to emissions regulations is strictly prohibited by federal law and may result in civil or criminal penalties, including fines up to $45,000 per vehicle under the Clean Air Act.
• This product is not certified by the EPA or CARB, and is therefore not legal for sale or use in California or any CARB-aligned state.

Assumption of Risk and Waiver of Liability

By purchasing and/or installing this product, you agree to:

1. Assume all risk and responsibility for compliance with applicable emissions laws.
2. Waive all claims, liabilities, and legal actions against Boost Dynamic Tuning, LLC and affiliates arising from unlawful use.
3. Release Boost Dynamic Tuning, LLC from any damages or penalties resulting from improper or illegal use.

⚖️ Indemnification Clause

You further agree to indemnify, defend, and hold harmless Boost Dynamic Tuning, LLC from any fines, penalties, damages, losses, or legal fees resulting from:

• Use of this product in a manner inconsistent with this disclaimer
• Misrepresentation of vehicle use
• Violation of emissions laws or regulations

Final Notice

This product is sold “as is” and “with all faults”, with no warranties regarding legality for highway use or emissions compliance.

It is the sole responsibility of the end-user to determine the legality of this product for the intended application. Boost Dynamic Tuning, LLC does not condone or recommend illegal street use or emissions equipment tampering.

By completing your purchase, you acknowledge that you have read, understood, and agreed to this disclaimer in full.

** PLEASE NOTE: If you schedule an appointment to flash your tune and you are late with no contact, a $50 late fee applies. If you need to reschedule, contact us at least one hour before your appointment or a $50 fee applies. **

DOWNPIPE NOTICE: BY PURCHASING A MOTORSPORT/RACING PRODUCT ("PRODUCT"), YOU REPRESENT THAT YOU UNDERSTAND AND AGREE THAT: THE PRODUCT IS NOT DESIGNED TO MEET ANY APPLICABLE EMISSIONS STANDARDS, THE PRODUCT IS NOT C.A.R.B. COMPLIANT, AND IS NOT FOR SALE OR USE IN CALIFORNIA OR ANY JURISDICTION WHERE PROHIBITED BY LAW. BOOST DYNAMIC TUNING, LLC DISCLAIMS ANY CLAIMS OF EMISSIONS COMPLIANCE. BY PURCHASING, YOU AGREE IT IS YOUR RESPONSIBILITY TO INFORM YOURSELF OF ALL APPLICABLE LAWS.