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

Big Turbo B6? Cool. Now Let’s Make It VIOLENT. ?

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FITMENT & COMPATIBILITY

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BDT STAGE 3 ECU TUNE FEATURES

• Big-turbo power support — K04 / GT28 / GT30+ (larger frames may require forged rods)
• Injector calibration for EV14 (550–1000cc), Siemens 630cc, 440cc+ setups
• Refined boost curve for clean spool + smooth, linear power (no surging, no drama)
• Torque limiters raised & speed limiter removed
• Fueling optimized by throttle position for crisp response
• Timing strategy adjusted safely for your fuel + turbo
• Variable Valve Timing recalibration for stronger midrange pull
• LPFP/HPFP pressure targets increased (build-dependent)
• OBDII flashing — install from home
• Award-Winning 2-Step + No-Lift-Shift (NLS) for manuals
• Optional crackles / overrun burbles (configurable)
• MAF-less tuning available (build dependent)
• Immobilizer delete available for ECU swap setups

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2002–2005 Audi A4 B6 1.8T — STAGE 3

Stage 3 is the final form. When the turbo upgrade goes on, the tune has to match it — or you’re leaving power (and safety) on the table.

With the right setup, Stage 3 is capable of: ~350 WHP on K04 builds and 400–500+ WHP on GT28/GT30+ setups. Power depends on turbo, fueling, intercooling, exhaust, and engine internals.

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AWARD-WINNING 2-STEP LAUNCH CONTROL

This is the same 2-Step that’s stacked 34+ event wins. Hard-hitting anti-lag vibe, instant spool, and launches that don’t feel fake.

CRACKLE POPS / OVERRUN (OPTIONAL)

Lift at high RPM and hear that nasty decel chatter. Stock exhaust = subtle. Big turbo + high-flow = absolute menace.

BOOST CONTROL DIALED FOR YOUR TURBO

Big turbos need clean control — not lazy factory logic. We shape your boost curve for fast spool, stable peak, and strong pull to redline.

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PERFORMANCE GAINS (HARDWARE DEPENDENT)

Real-world output varies by turbo size, fuel system, intercooling, exhaust, altitude, and engine internals.

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ECU TUNE MODIFICATION REQUIREMENTS

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SOFTWARE INSTALLATION REQUIREMENTS

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MAINTENANCE & HEALTH CHECK (DON’T SKIP THIS)

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 EPA or the CARB, and is therefore not legal for sale or use in California or any CARB-aligned state.

The EPA has enforcement authority to pursue manufacturers, sellers, installers, and end-users of defeat devices.

Assumption of Risk & Waiver of Liability

• Assume all risk and responsibility for compliance with local, state, and federal laws.
• Waive all claims against Boost Dynamic Tuning, LLC arising from unlawful use.
• Release Boost Dynamic Tuning, LLC from damages, injuries, or penalties resulting from improper or unlawful use.

⚖️ Indemnification Clause

You agree to indemnify, defend, and hold harmless Boost Dynamic Tuning, LLC from any fines, penalties, damages, losses, or legal fees resulting from misuse, misrepresentation, or violation of emissions laws.

Final Notice

Sold “as is” and “with all faults,” with no warranties regarding legality for highway use or emissions compliance. End-user is responsible for determining legality. BDT does not condone illegal street use or emissions tampering.

DOWNPIPE NOTICE: By purchasing a motorsport/racing product, you acknowledge it is not designed to meet emissions standards (including CARB) and may be illegal in certain jurisdictions. You are responsible for understanding applicable laws.