2002 - 2005 A4 B6 1.8T Stage 3

Unlock Real Power in Your 1.8T

Stop driving a detuned sleeper — it’s time to let that turbocharged 1.8T eat.

At Boost Dynamic Tuning (BDT), we build hard-hitting ECU tunes that transform your car from stock and slow to snappy, crackly, and full of attitude. All Stage tunes are dyno-tested and street-proven, giving you that extra punch, better throttle response, and addictive turbo power you’ve been missing.

Whether you’re ripping through tunnels or dropping jaws at meets, this tune brings the heat.
No guesswork. No weak files. Just real performance — the kind that sounds wild and pulls even harder.

This is the tune your 1.8T should’ve had from the factory.
Let’s wake it up

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BDT STAGE 3 TUNE FEATURES

- Increased Horsepower and Torque Gains

-Injector calibration

- Speed Limiter Removed

- Torque Limiters Raised

- Fueling Requested Changed (Depending on Throttle Position)

- Overrun/Crackle

- Boost Control Refined for a Linear boost onset 

- Turbocharger Lag Reduced

- Low Pressure Fuel Pump Pressure Increased

- Variable Valve Timing Recalibration

- OBDII Port Flashing

-AWARD WINNING 2STEP!!! WE'VE WON OVER 34 DIFFERENT EVENTS!!!

-No Lift To Shift, also known as NLS

-Mafless tune

-Immobilizer off so your car starts with the new ecu

-Off Road use only= N80, N249... etc removed from ecu

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2002-2005 Audi A4 STAGE 3 ECU TUNE

Experience the thrill of unparalleled performance with Boost Dynamic Tuning’s Stage 2 ECU calibration, expertly engineered to elevate your ride by delivering up to 350-500 Wheel HP and 350-450 Wheel TQ. This depends on your turbo setup, and engine internals. Our innovative calibration approach safely and effectively unlocks the full potential of your factory turbocharger. Get ready to put those unsuspecting Hellcat challengers in their place, leaving them in your rearview mirror with dented pride and a newfound respect.

AWARD WINNING 2 STEP! 

Our 2-step launch control is renowned worldwide for delivering the hardest-hitting, fireball-spitting, true anti-lag action! If you're ready to get rowdy and unleash some insane, chest-thumping 2-step sounds, then this is exactly what you’ve been looking for! Get ready to turn heads and set the streets on fire!

CRACKLE POPS

This exciting calibration feature, commonly referred to as overrun, enhances your driving experience in a thrilling way. When you decelerate from high RPMs or rev freely in neutral or park, you'll relish the exhilarating crackle and pop emanating from your exhaust and downpipe (though it may be less noticeable on stock exhaust setups). It’s the perfect way to add an extra dash of excitement to your already captivating exhaust sound!

BOOST CONTROL 

From the factory, the ECU’s boost control delivers a rough and inconsistent boost curve, leading to sluggish response times that can be felt during extended power pulls across the vehicle's full powerband. With BDT’s Stage 2 ECU Tune, we fine-tune and polish this boost curve for an exhilarating, seamless power delivery that guarantees a sharp and immediate response when you push your car to its limits. Get ready to experience a transformation that elevates thrill and performance like never before! 

Immobolizer Delete

This allows you to install our optimized ECU in your vehicle and start the engine without triggering the security feature. This security feature, known as the immobilizer, prevents the vehicle from starting if the correct PIN code is not communicated between the modules. 

POWER GAINS

ECU TUNE MODIFICATION REQUIREMENTS

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 Environmental Protection Agency (EPA) or the California Air Resources Board (CARB), and is therefore not legal for sale or use in California or any state that follows CARB standards.

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: 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, WHETHER IN THE USA OR OTHERWISE, THE PRODUCT IS NOT C.A.R.B. COMPLIANT, AND THAT THE PRODUCT IS NOT FOR SALE OR USE IN CALIFORNIA, USA NOR ANY OTHER JURISDICTION WHERE THE SALE OR USE IS PROHIBITED BY LAW. BOOST DYNAMIC TUNING, LLC MAKES NO REPRESENTATIONS, WARRANTIES, OR CLAIMS THAT THIS PRODUCT COMPLIES WITH ANY APPLICABLE EMISSIONS LAWS AND EXPRESSLY DISCLAIMS ANY AND ALL SUCH REPRESENTATIONS, WARRANTIES, AND CLAIMS, WHETHER EXPRESS OR IMPLIED. BY PURCHASING THIS PRODUCT, YOU REPRESENT, WARRANT, AND AGREE THAT IT IS YOUR RESPONSIBILITY TO INFORM YOURSELF OF ANY LAWS OR REGULATIONS THAT MAY APPLY TO YOUR PURCHASE AND/OR USE OF THE PRODUCT.

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, WHETHER IN THE USA OR OTHERWISE, THE PRODUCT IS NOT C.A.R.B. COMPLIANT, AND THAT THE PRODUCT IS NOT FOR SALE OR USE IN CALIFORNIA, USA NOR ANY OTHER JURISDICTION WHERE THE SALE OR USE IS PROHIBITED BY LAW. BOOST DYNAMIC TUNING, LLC MAKES NO REPRESENTATIONS, WARRANTIES, OR CLAIMS THAT THIS PRODUCT COMPLIES WITH ANY APPLICABLE EMISSIONS LAWS AND EXPRESSLY DISCLAIMS ANY AND ALL SUCH REPRESENTATIONS, WARRANTIES, AND CLAIMS, WHETHER EXPRESS OR IMPLIED. BY PURCHASING THIS PRODUCT, YOU REPRESENT, WARRANT, AND AGREE THAT IT IS YOUR RESPONSIBILITY TO INFORM YOURSELF OF ANY LAWS OR REGULATIONS THAT MAY APPLY TO YOUR PURCHASE AND/OR USE OF THE PRODUCT.