GIAC Stage 3 K04-23 software upgrade


Stage 3 K04-23 adds horsepower, torque and more throttle response throughout the power band. The requirements to run this calibration are: 380 cc injectors (real S3/225TT 380 or Deka 1 Siemens 380) 225 TT 3inch OD MAF with real TT sensor not golf jetta (Part number: 06A906461EX) upgraded intercooler with less than 2 pounds of pressure drop and upgraded connecting rods.

SKU: GIACVW_205 Category: Tag:


Upgrade your VW Golf ® / GTI MK4 2000 – 2005, 1.8 Turbo 180ps with GIAC Stage 3 K04-23

  • Horsepower gain: 177 HP -> 265 HP* (pump mode)/310 HP** (race mode)
  • Toque gain: 173 Ft-Lbs -> 265 Ft-Lbs* (pump mode)/310 Ft-Lbs** (race mode)

Optional switcher with stock, race, kill, valet and/or firewall mode may be available for in car map switching starting at $220 (contact us for details)

We highly recommend the car to be in perfect mechanical condition. Availability is dependent on the ECU version of the car (listed below) and if not know we will be glad to check it (complementary) if you visit us with the car. HP and torque figures are average engine estimates. They are derived from wheel power and acceleration testing. Results may vary depending on a variety of factors. These are transmission, vehicle health, operating conditions, temperatures and other environmental conditions, dyno type, dyno setup, fuel grade, other variables and modifications.

Please choose the local pickup option at check out, when you purchase the product.

* 91 octane fuel compatible. 93 octane fuel for optimum results.

** 100 octane fuel compatible. 105 octane fuel for optimum results. Optional switcher or remapping required.

This product is valid for the following car VW Golf ® / GTI MK4 2000 – 2005, 1.8 Turbo 180ps and following ECUs (feel free to stop by our shop to check yours): 06A906032DL; 06A906032HN; 06A906032HS; 06A906032LQ; 06A906032LP; 06A906032ML; 06A906032NK; 06A906032NL; 06A906032PL; 06A906032RN; 06A906032SJ; 06A906032SK; 06A906032SM.

Hand Held Flashloader Switcher

GIAC’s Flashloader Handheld Switcher allows users to switch between GIAC-tuned software programs with the touch of a button. The product is a pocket-sized, hand-held device that plugs directly into the OBD port. It uses serial flashing technology and requires no additional hardware within the DME. To use the switcher, you should select the desired mode with the touch buttons. Cycling the ignition will save the new mode to the ECU’s memory and retain its state until switched again.

Installation details

After you purchase the software, we will contact you to schedule an appointment to install it. The installation must be done at our shop in Culver City, CA (full address) with a physically present car.

Give us a call at (562) 448-2599, send us an email to, or also use our contact form (click here) if you have any questions.

Pictures used for marketing purposes only, actual product may vary.


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VolkswagenGTIMK IV (1999-2005)1.8TAll