GIAC is an engine and transmission controller calibration house that tunes some of the fastest cars in the world. GIAC believes that tuning is an art, striking the perfect balance between speed, strength, and agility based on the drivers personal preference. GIAC exists to tune cars for the way you want to drive! With over 20 years of industry experience and a dedicated team of software experts at their facility in Irvine, CA, GIAC has the tune for you!

GIAC creates tuning products for:

Audi, BMW, Porsche, and Volkswagen.


GIAC prides themselves on developing tuning software that creates "factory smooth" performance by replacing your car's standard control unit and offering tuning options in ignition timing, fuel delivery, fuel metering, boost settings, rev limiters, and speed limiters to optimize performance, and in some instances, fuel economy. GIAC performance-tuned programs are designed to dramatically improve torque and horsepower without sacrificing drivability. GIAC tunes can be configured to work with any number of aftermarket parts and are perfect for any build!


The GIAC Flashloader Mobile or FLM is a pocket sized portable device that allows the user to load or remove GIAC performance programs onto their vehicle. Unlike other tuning devices, the portable FLM does not require a laptop to load tunes to your vehicle! Files and commands are stored on a USB drive that can be customized to use the FLM as a flashing tool, data logger, performance mode switcher, code clearer or any combination of each.


If youre looking to get a performance tune for your Audi, you came to the right place! GIAC offers performance software for Audi models such as A1, A3, A4, A5 ,A6, A7, A8, as well as the S and RS variations of each. GIAC also has you covered on tunes for the TT, TTRS, Q3, and Q5 models.



GIAC tuning software is avaialble for multiple BMW models including 1,2,3,4, and 5 series, as well as M-Models and Z series cars. Whatever trim level or sport package your BMW is, GIAC has a tune made for your car! Take your BMW to the next level with GIAC.


GIAC has you covered if you're looking to custom tune you're Porsche vehicle! GIAC creates tunes for a ton of Porsche models including Boxter, Cayman, 911, GT3, GT2, Panamera, Cayenne and Macan! Porsche tunes from GIAC are model, motor, and year specific so you will always be getting a performance software developed specifically for your vehicle.


GIAC makes tuning software for a wide range of Volkswagen models including Golf/GTI MK3,4,5,6, and 7, VR6, as well as well as models such as the Polo, Golf R, Jetta, Scirocco, Beetle, Rabbit, Passat, Tiguan, and more! Whatever you VW model or motor may be, GIAC can get you tuned!

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