2002–2005 Volkswagen GTI / Jetta / GLI / Golf — Stage 3 ECU Tune

Unlock Real Power in Your 1.8T

Stop cruising a detuned sleeper — it’s time to let your turbocharged 1.8T eat. At Boost Dynamic Tuning (BDT), we build hard-hitting ECU calibrations that turn “stock and slow” into snappy, loud, and fast. Our Stage 3 files are dyno-tested & street-proven for extra punch, sharper throttle, and boost that pulls like a freight train.

No guesswork. No weak files. Just real performance — the kind that sounds wild and pulls even harder.

Stage 3 ECU Tune Features

• Big-turbo power support — K04 / GT28 / GT30+ (forged rods recommended on larger frames)
• Injector calibration and fueling strategy matched to your setup
• Refined boost curve for smooth, linear power and reduced turbo lag
• Torque limiters raised & speed limiter removed
• Optimized fueling by throttle position
• Variable Valve Timing recalibration & pressure target optimization (LPFP/HPFP build-dependent)
• Crackle / overrun burbles (configurable)
• Award-Winning 2-Step & No-Lift-Shift (NLS) for manuals
• Mafless tuning option (build-dependent)
• Immobilizer delete available — drop in the ECU and go

Performance Gains

Power varies with turbo, fuel system, intercooling, exhaust, and engine internals.

ECU Tune — Modification Requirements

Emissions Compliance Notice & Legal Disclaimer

FOR COMPETITION USE ONLY — NOT FOR STREET USE. This product is intended solely for vehicles used in closed-course racing, off-road competition, or organized motorsport events. It is not legal for use on pollution-controlled vehicles operated on public roads or highways under the Clean Air Act (42 U.S.C. § 7522) and applicable state laws.

Federal and State Emissions Compliance

• May modify, bypass, or render inoperative emissions control devices (e.g., catalytic converters, oxygen sensors, EGR, OBD systems).
• Installation or use on emissions-regulated vehicles is strictly prohibited and may result in civil or criminal penalties (up to $45,000 per vehicle).
• Not certified by EPA or CARB; not legal for sale or use in California or other CARB-aligned states.

EPA 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

• You assume all risk and responsibility for legal compliance.
• You waive claims against Boost Dynamic Tuning, LLC arising from unlawful use.
• You release Boost Dynamic Tuning, LLC from damages, injuries, or penalties resulting from improper or unlawful use.

⚖️ Indemnification

You agree to indemnify, defend, and hold harmless Boost Dynamic Tuning, LLC from any fines, penalties, damages, or legal fees resulting from:

• Use of this product inconsistent with this disclaimer
• Misrepresentation of vehicle use
• Violation of 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 highway use or emissions compliance. It is the end-user’s responsibility to determine legality for their application.

By completing your purchase, you acknowledge that you have read, understood, and agreed to this disclaimer in full.