BDT Stage 2 ECU Tune

Audi B9 A4 / A5 2.0T TFSI EA888 Gen 3

Slide behind the wheel, tap the start button, and feel the difference immediately — this isn’t your stock A4/A5 anymore. BDT Stage 2 transforms the 2.0T into a sleeper missile: faster spool, stronger mid-range torque, and crisp power delivery that stays smooth enough to daily. Whether you’re carving backroads, cruising the freeway, or flexing on a night run, this calibration brings the car alive the way Audi should’ve from day one.

Refined when you want it. Savage when you don’t.

Fitment & Compatibility

BDT ECU Tune Features

• Increased horsepower and torque gains
• Speed limiter removed
• Neutral/Park rev limiter raised (TCU tune recommended)
• Auto Start/Stop defaults to OFF (still functional)
• Torque limiters raised
• Fuel/Torque request optimized by load & throttle
• Stock boost gauge recalibrated to display higher boost
• Optional overrun/crackle in Dynamic/Sport mode
• Engine VE remapped for a smooth power curve
• Refined boost control for linear boost onset
• Reduced turbo lag
• LPFP/HPFP pressure targets increased
• Variable valve timing recalibration
• OBDII port flashing for quick remote install

B9 A4 / A5 Stage 2 ECU Tune

From the factory, the B9 A4/A5 2.0T delivers a smooth ~232 HP / 262 TQ. With BDT Stage 2, expect up to ~362 HP / ~442 TQ on 93 octane. That’s a massive bump in usable torque and mid-range pull while keeping daily drivability and OEM-style safety logic intact.

Crackle Pops (Overrun)

Optional overrun/crackle adds controlled pops on decel in Dynamic/Sport mode. We offer three levels (Low / Medium / High) so you can match your vibe. Subtle on stock exhaust, wild on aftermarket setups — always tuned with RPM windows and exhaust-temp safeties.

Dyno-Verified Power Gains

Expected Stage 2 gains on 93 octane: up to ~362 HP / ~442 TQ. Results vary with dyno type, altitude, weather, fuel quality, and hardware condition.

ECU Tune Modification Requirements

Stage 2 hardware (quick view): A high-flow downpipe is REQUIRED. Intake and intercooler upgrades are strongly recommended for heat control and repeatable gains. A TCU/DSG tune is highly recommended where equipped.

Software Install Requirements

WINDOWS LAPTOP REQUIRED (NO APPLE)

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

I WANT YOUR CAR TO SURVIVE MULTIPLE YEARS TO COME WITH MY TUNE. I DON'T RECOMMEND THESE FOR FUN. I HAVE TUNED COUNTLESS EA888 CARS AND THIS IS WHAT I'VE SEEN THROUGH THE YEARS. IF YOU CAN'T AFFORD THE PARTS, PLEASE DON'T TUNE YOUR CAR. BEING STRAIGHT FORWARD SO YOU DON'T BLAME MY TUNE.

Late Policy: If you book an in-person flash and arrive late without notice, a $50 fee applies. Reschedules must be made at least 1 hour prior.

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-adopting 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 local, state, and federal laws and regulations.
2. Waive all claims, liabilities, and legal actions against Boost Dynamic Tuning, LLC, its officers, directors, employees, and affiliates arising from the purchase, installation, or use of this product in violation of any applicable law.
3. Release Boost Dynamic Tuning, LLC from any and all damages, injuries, or penalties resulting from improper or unlawful 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 any emissions laws or regulations

Final Notice

This product is sold “as is” and “with all faults”, with no warranties, expressed or implied, regarding legality for public 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.

DOWNPIPE NOTICE: Motorsport/racing products are not designed to meet emissions standards. Not CARB-compliant. Not legal for sale or use in California or other restricted states.

Cable must be shipped back after tune is complete within 3 business days, or there will be a $1000 charge to your account.