2002–2005 Audi A4 1.8T Stage 2 ECU Tune (B6)

Stage 2 = The B6 Finally Goes Full Villain ?

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FITMENT & COMPATIBILITY

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BDT STAGE 2 ECU TUNE FEATURES

• ~+60 HP / +70–80 TQ gains over a healthy Stage 0 car
• Boost targets optimized for fast spool and hard pull
• Speed limiter removed & torque limiters raised
• Fueling requested optimized by throttle position
• Boost control refined for smooth, linear onset
• Turbo lag reduced / faster spool & sharper throttle response
• LPFP targets increased safely (build-dependent)
• Variable Valve Timing recalibration for stronger midrange
• OBDII flash at home — no shop, no downtime
• Award-Winning 2-Step + No-Lift-Shift (NLS) for manuals
• Optional overrun crackles & pops
• MAF-less tuning available (build-dependent)
• Immobilizer delete available for ECU swap setups
• TRACK USE ONLY (N80/N249/Rear O2/SAI/EVAP — off-road only)

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2002–2005 Audi A4 B6 1.8T — STAGE 2

Stage 2 is where the K03 hits its sweet spot. Boost comes in earlier, pulls harder through the midrange, and stays strong up top.

With the right supporting mods and 93 octane, you can expect around: ~265 WHP / ~285 WTQ on a healthy setup. Numbers vary by altitude, exhaust, intercooling, and maintenance — but the seat-time difference is HUGE.

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AWARD-WINNING 2-STEP LAUNCH CONTROL

34+ event wins don’t happen by accident. This is real anti-lag energy — loud, crisp, and nasty in the best way.

CRACKLE POPS / OVERRUN (OPTIONAL)

Lift off at high RPM and the tune dishes out that spicy decel chatter. Stock exhaust = subtle. High-flow/downpipe = straight menace.

BOOST CONTROL DIALED

Factory boost is inconsistent and lazy. Stage 2 smooths the curve and sharpens response so your B6 surges clean through the powerband.

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POWER GAINS

Power varies with fuel quality, altitude, engine health, and supporting mods.

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ECU TUNE MODIFICATION REQUIREMENTS

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SOFTWARE INSTALLATION REQUIREMENTS

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MAINTENANCE & HEALTH CHECK (READ 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.