2002–2005 Volkswagen GTI / Jetta / GLI / Golf / Beetle 1.8T AWP — Stage 3 Big Turbo ECU Tune

Build It. Bolt It. Then Let BDT Make It Violent.

You didn’t go Stage 3 to be “a little faster.” You went Stage 3 because you want a full-send Mk4 that spools hard, hits like a hammer, and keeps pulling.

Boost Dynamic Tuning (BDT) Stage 3 is a custom big-turbo calibration built around YOUR setup — turbo, injectors, fueling, intercooler, exhaust, and boost control. No canned files. No guesswork. Just a tune that matches your build and makes it rip.

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BDT STAGE 3 TUNE FEATURES

• Big-turbo power support — K04 / Hybrid / GT28 / GT30+ (forged rods strongly recommended on larger frames)
• Custom injector calibration matched to your injectors + MAF housing / MAP strategy
• Boost curve dialed in for fast spool, smooth delivery, and top-end pull
• Torque limiters raised & speed limiter removed
• Fueling optimized by throttle position
• Variable Valve Timing recalibration (build-dependent)
• Crackle / overrun burbles (configurable intensity)
• Award-Winning 2-Step + No-Lift-Shift (NLS) for manuals
• Mafless tuning option (build-dependent)
• Immobilizer delete available — drop in ECU and go
• OBDII remote flashing — no shop, no drama

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PERFORMANCE GAINS

Power varies with turbo, fuel system, intercooling, exhaust, engine health, and boost control strategy.

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ECU TUNE MODIFICATION REQUIREMENTS

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INCLUDED WITH STAGE 3

• No-Lift-Shift (NLS) for manuals (average setpoint ~6000 RPM)
• Award-Winning 2-Step / Launch Control (average setpoint ~4500 RPM — manuals only)
• Crackle Pops / Overrun — Light / Medium / Intense (tell us your preference)
• Mafless option (build-dependent)
• Immobilizer delete available (for PnP ECUs or immo issues)

OPTIONAL TRACK USE ONLY 

• N249
• EVAP / N80
• Rear O2
• SAI (Secondary Air Injection)

*If you need special requests (AEB VVT removal, custom MAF housing, altitude setup, etc.) just note it at checkout.*

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 & Waiver of Liability

• 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 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—express or implied—regarding legality for public highway use or emissions compliance. It is the sole responsibility of the end-user to determine legality for intended application. Boost Dynamic Tuning, LLC 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 sale/use may be prohibited by law in certain jurisdictions (e.g., California). You are responsible for understanding applicable laws.