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AUDI / VOLKSWAGON Remote Tuning (2016 - 2020+)
CTZ Flasher Remote Tuning Service (2016–2020+ Audi / Volkswagen Vehicles)
Unleash the full potential of your Audi or Volkswagen with our CTZ Flasher Remote Tuning Service, designed for 2016–2020+ models equipped with Simos 18, Simos 19, MG1, or MD1 ECUs.
Compatible with popular models such as Audi A3, A4, A5, A6, S3, S4, S5, Q5, Q7 and Volkswagen Golf GTI, Golf R, Jetta, Passat, Tiguan, Arteon, and Atlas — our tuning method delivers proven performance and reliability with no ECU removal required.
Enjoy more power, sharper throttle response, and smoother drivability — all done safely from your phone or laptop.
How It Works
Place your order and provide your vehicle details (year, model, and ECU type).
We ship you our CTZ Flasher device directly to your address.
You can use either a Windows laptop (recommended) or your mobile phone (Android or iOS for supported models).
Mac users can tune by installing Parallels Desktop to run Windows if needed.
Once you receive your CTZ Flasher, we’ll schedule your remote tuning session.
Our technician connects to your computer or guides you through the process via AnyDesk for secure remote support.
You don’t have to do anything yourself — we’ll be on the phone with you, controlling your screen and handling the full tuning process.
This method allows us to safely read, modify, and flash your ECU without removal or downtime.
ECU Unlock Requirements (2019–2020+ Models)
Some newer ECUs (especially Simos 19, MG1, and MD1) may require an unlock before tuning.
We’ll confirm if your ECU needs this after reviewing your details.
If required, we’ll provide a shipping label for you to send your ECU to us or our authorized unlock partner.
Once unlocked, your ECU is returned ready to flash — after that, all future tune updates can be done remotely from your phone or laptop, no more shipping required.
Purchase or Borrow Options
Borrow the CTZ Flasher → Included with your service price. Return it with the prepaid shipping label after tuning.
Buy the CTZ Flasher → Keep it for future tunes, data logging, and diagnostics (+$400 upgrade fee).
(If the borrowed flasher is not returned, the purchase fee will be charged.)
Custom Add-Ons Available
Enhance your Audi or Volkswagen with:
Pops & Bangs
Exhaust Burble Tune
Launch Control (where supported)
Rev & Speed Limiter Adjustments
DSG / S-Tronic Transmission Optimization
Fuel Efficiency Tunes
Each tune is custom-tailored to your exact engine, transmission, and driving preferences.
Upgrade your 2016–2020+ Audi or Volkswagen with the CTZ Flasher Method — offering flexible phone or laptop tuning, full remote support, and professional calibration from the experts at Custom Tunez.
Power. Precision. Confidence. Delivered.
We ask for your VIN up front so the calibration is built for your exact car — not a generic file.
Before you order
Not sure this is the right file for your car? Ask first — we would rather talk you out of the wrong product than refund it.
Your factory file is archived
Going back to stock is always one flash away.
Built for your VIN
That is why we ask for it at checkout — the calibration is written for your exact engine and software version, not a generic map.
Support after the sale
Installation help by phone, and an engineer on the line for remote flashes.
Not sure which one you need?
Tell us the year, model and what's already on the car. We'll point you at the right product in one call.