Bad Files Cost You Clients. Our Hand-Tuned ECU Files Win You Business.
No Guesswork.

Hand-made tuning files and WinOLS projects that work.
No checksum issues, no guesswork. Delivery from 15 minutes.
Full support. 100% satisfaction.

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Why us?

More than 60,000+ projects

Our database contains more than 60,000 WinOLS projects, each carefully processed and tested by professional tuners. From Stage 1–3 to advanced solutions like DSG tuning, DPF/EGR off, and special mods — every project is crafted for precision, reliability, and real-world performance.
15+ Years of tuning experience

We’ve been tuning cars for over 15 years — from daily drivers to high-performance builds. Our files are safe, tested, and built to deliver real results.
Clients in 40+ countries

Tuners from over 40 countries trust our files. No matter where you are, you get the same high-quality service and proven results.

All our files are both dynotested and road tested!

Every file is both dyno-tested and road-tested to ensure maximum performance, safety, and drivability in real-world conditions. No guesswork — just proven results.

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How Our File Service Works:

Register on our portal in easy steps

Log in with your credentials and upload your original file or buy a ready project

Receive your tuned file and flash it to your or your client's car

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Advantages of our file service

Fast Delivery

Spacious and multifunctional indoor spaces designed to surpass expectations
60K+ Projects Completed

Constructed with high-quality eco-friendly materials to protect the environment
Support 7 Days a Week

Constructed with high-quality eco-friendly materials to protect the environment
Hand-Tuned by Experts

Constructed with high-quality eco-friendly materials to protect the environment

Tuning Solutions for Every Vehicle:

From cars and motorcycles to ATVs and heavy-duty trucks — we’ve got you covered

Stage 1/2/3+

OPF off

DPF/EGR off

Immo off

Adblue off

Etc.

Heavy-Duty Vehicle Solutions

With years of experience tuning Cummins and Caterpillar engines, we deliver reliable solutions for trucks, construction equipment, agriculture, and industrial machines.

Our services include DPF/EGR/AdBlue OFF, torque increase, and fuel-saving calibrations, all custom-built for demanding environments. Every file is hand-processed, tested, and tailored for real-world use — no generic maps.

About us

At ols.win, we deliver more than just tuning files — we deliver confidence. With over 15 years of hands-on tuning experience and 60,000+ dyno-tested projects, we help garages, tuners, and resellers around the world get results they can trust.

Every file is hand-crafted, road-tested, and backed by real support — no scripts, no shortcuts.

Whether you're flashing 5 cars a day or building your brand, we're here to power your growth.

Real tuning. Real results. No compromises.

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