MK4 GTI / Jetta / GLI / BEETLE 1.8T AWP Stage 1 ECU Tune

Wake Up Your AWP — The Tune That Makes the 1.8T Feel Alive Again

Your MK4 isn’t “old.” It’s a turbo legend that’s been sleeping way too long. BDT Stage 1 is the fastest way to turn your AWP into the car it should’ve been from the factory — snappy throttle, harder pull, and that classic 1.8T surge that hits right now.

No recycled files. No cookie-cutter junk. This is a dyno-backed, street-proven calibration built to rip while staying daily-drivable. Install from home with simple OBDII remote flashing.

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FITMENT & COMPATIBILITY

2001–2005 VW GTI / Jetta / Golf MK4 with 1.8T AWP engine
Manual or Automatic (2-Step not available on auto ECUs).

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BDT STAGE 1 TUNE FEATURES

• Big horsepower & torque gains over stock
• Boost targets optimized for a faster, harder spool
• Speed limiter removed
• Torque limiters raised
• Fueling optimized by throttle position
• Optional overrun / crackles & pops
• Boost control refined for smooth, linear delivery
• Turbo lag reduced
• Low-pressure fuel pump pressure increased
• Variable valve timing recalibration
• OBDII port flashing — install from home
• Award-Winning 2-Step & NLS (No-Lift-Shift) where applicable
• MAF-less tuning available
• Immobilizer delete available
• Optional off-road deletes (N80, N249, etc.)

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AWP 1.8T STAGE 1 — WHAT IT FEELS LIKE

Stage 1 is the sweet spot for stock-turbo AWP cars. You get a fatter midrange, quicker response, and a pull that keeps climbing instead of falling flat. It’s that “why didn’t it feel like this stock?” moment the first time you hit boost.

CRACKLE POPS / OVERRUN (OPTIONAL)

Lift at higher RPMs or blip it in neutral and you’ll hear sharp, clean crackles from the exhaust. Subtle on stock exhaust, nasty on open setups.

BOOST CONTROL REFINED

Factory boost delivery can feel lazy and uneven. BDT Stage 1 smooths the boost curve and sharpens response so your AWP pulls clean all the way through.

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POWER GAINS

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ECU TUNE MODIFICATION REQUIREMENTS

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IF YOU WANT YOUR CAR TO SURVIVE, THESE MUST BE DONE!

I WANT YOUR CAR TO SURVIVE MULTIPLE YEARS TO COME WITH MY TUNE. I DON'T JUST RECOMMEND THESE FOR FUN. I HAVE TUNED COUNTLESS 1.8T CARS AND THIS IS WHAT I'VE EXPERIENCED THROUGH THE YEARS. IF YOU CAN'T AFFORD THE PARTS, PLEASE DON'T TUNE YOUR CAR.

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 inconsistent with this disclaimer, misrepresentation of vehicle use, or violation of emissions laws or regulations.

Final Notice

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 the legality for the intended application. Boost Dynamic Tuning, LLC does not condone or recommend illegal street use or emissions equipment 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.