2002–2005 Audi A4 1.8T Stage 3 ECU Tune (B6)

Unlock Real Power in Your 1.8T

Stop driving a detuned sleeper — it’s time to let your turbocharged 1.8T eat. With Boost Dynamic Tuning’s Stage 3 ECU calibration, your Audi transforms into a true street weapon, delivering the performance your 1.8T always should have had from the factory.

Proven Dyno Results

• Stock Advertised: 180 HP / 173 TQ
• BDT Baseline Dyno: 175 WHP / 170 WTQ
• Stage 1: 245 WHP / 250 WTQ
• Stage 2: 265 WHP / 285 WTQ
• Stage 3: 350–500 WHP / 350–500 WTQ (depending on turbo + supporting mods)

That’s as much as +325 WHP over stock with the right setup.

Stage 3 ECU Tune Features

• Injector calibration (supports EV14, Siemens, 440cc–1000cc setups)
• Massive horsepower & torque gains with K04 / GT28 / GT30 turbos
• Speed limiter removed
• Torque limiters raised
• Fueling optimized by throttle position
• Overrun crackles & pops (optional)
• Boost curve refined for linear, consistent delivery
• Reduced turbo lag with faster spool
• Raised LPFP & HPFP fuel pressure
• Variable valve timing recalibration
• Flashable via OBDII port — no shop visit required
• Award-Winning 2-Step & No-Lift-Shift (NLS)
• Mafless tuning available
• Immobilizer delete available
• Off-road calibration options (N80, N249 deletes, etc.)

Award-Winning 2-Step Launch Control

Our 2-step launch control is world-renowned, delivering the hardest-hitting, fireball-spitting anti-lag action. If you’re ready for rowdy, chest-thumping launches that turn heads, BDT’s 2-step will set your car — and the crowd — on fire.

Crackles & Pops (Overrun)

Add raw excitement to every drive. On decel from high RPMs or revving in neutral, you’ll hear sharp, aggressive pops and crackles. Subtle with stock exhaust, wild with aftermarket setups — the perfect way to add character to your Audi’s sound.

Boost Control Optimization

From the factory, the 1.8T’s ECU delivers a rough, inconsistent boost curve. Our Stage 3 calibration smooths it out for:

• Faster spool and sharper throttle response
• Linear boost delivery across the powerband
• Consistent acceleration in every gear

ECU Tune Modification Requirements

• Bigger Turbo: K04, GT28, GT30 or larger (Best Choice Hybrid Turbo)
• Air Intake: Required
• Intercooler: Required
• Drivetrain Inserts: Recommended
• Downpipe / High-Flow Cat: Required
• Upgraded Diverter Valve: Required
• Spark Plugs: BKR8EIX .028 Gap Required
• Injectors: EV14 550cc / 1000cc, Siemens 630cc, or equivalent
• Manual Boost Controller: Best Choice
• Low Pressure Fuel Pump (LPFP): DeatschWerks DW340LP or higher

? 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.

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.

The U.S. Environmental Protection Agency has enforcement authority under the Clean Air Act to pursue manufacturers, sellers, installers, and end-users of defeat devices.

Assumption of Risk and Waiver of Liability

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

• Assume all risk and responsibility for compliance with applicable local, state, and federal laws and regulations.
• 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.
• 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. You further certify that this product will be used solely in sanctioned competition and off-road applications.

Jurisdiction: Any disputes shall be governed by the laws of the State of South Carolina, with exclusive jurisdiction and venue in Beaufort County, SC.