VW MK4 1.8T Stage 1 Tune (AWW/AUM/AWP)

STAGE 1: 220 HP / 240 LB-FT

Fits

VW MK4 Golf, GTI, Jetta and New Beetle 1.8T with engine code AWW (150 hp, 2000-2005), AUM (150 hp, 2001-2005) or AWP (180 hp, 2000-2005, also the Audi TT 180). All three share the same hardware, which is why they are grouped on one listing. The calibration itself is written for your engine code. Not sure which code you have? Find your engine code in two minutes. AWD and APH are narrowband and have their own Stage 1.

What Stage 1 does

18 psi on the stock K03, written for 93 octane / 98 RON and adapts to 91 / 95. Lag removed, speed limiter removed, rev limit raised to 7000, and better mileage when you are not in it. The calibration is written for the factory intake, exhaust and fueling, so a stock car sharpens up without asking anything of it. Tested on the street and the track to be smooth yet powerful.

What you need on the car

• Required: nothing. Stage 1 runs on a completely stock car.
• Recommended: turbo-back exhaust, upgraded diverter valve, upgraded intercooler. None of them are needed, but the calibration accounts for them if they are there.
• Already have the exhaust and intercooler? Add a 4-bar fuel pressure regulator and start at Stage 2 instead. That is the same car with 22 psi and 235 hp.
• Plugs: run a one-step-colder plug gapped tight, NGK BKR7E or BKR7EIX at 0.028 inch. A wide gap blows the spark out under boost.

After you order

1. Order. Choose Remote Tuning. A GTS cable ships with your order for a one-time $40 and it is yours to keep for every tune after this one. Already have one? Choose "I already have a GTS Remote Tuning cable".
2. Read. Plug the cable into the OBD port and a Windows laptop, Windows 10 or later. An Intel Mac on Boot Camp works too. Our software identifies your ECU and saves your original calibration before anything is written.
3. Flash. We build the calibration for your engine code, your hardware and your fuel. You get a message the moment it is ready, and you flash it yourself in your driveway in about ten minutes.
4. Log. Drive, log, send. If anything wants adjusting we adjust it and you flash again. Revisions usually come back the same day, and within 72 hours at the outside.

Prefer to mail the ECU in? Mail-in is free within the USA and Canada. We flash it on the bench and send it back in two to three days. Local? An OBD flash at the shop takes 10 to 15 minutes. How remote tuning works, start to finish.

Options explained

• Launch control: Soft (no pops) is included free. Hard 2-step / antilag is an add-on, for off-road and competition use. Pick None if you do not want it.
• No-lift shift: included free with every GTS tune.
• Program switching: Stock and Tuned on one flash, switched from the driver's seat with no laptop. Stock for the dealer or a valet, Tuned for you. Pick None for tuned mode only.
• Pops and bangs: exhaust crackle on lift-off.
• Hard cut: a hard fuel cut at the rev limit instead of the factory soft limiter.
• IMMO delete: removes the immobilizer check so a swapped or spare ECU runs without the key and cluster handshake.
• Spare ECU: we supply a tuned ECU so your original stays untouched on the shelf.
• Mail or Remote: remote is what most owners pick. Mail-in if you would rather not touch a laptop. Own cable if you have tuned with us before.

Stage ladder: AWW / AUM / AWP

Start here if the car is stock and move up when the hardware changes. Read the 1.8T 20v Tuning Guide for what each stage really gains and which codes need a wideband swap first.