Anyone can make their own tunes in Forza. It comes down to doing the right math, taking a test drive and knowing how to make the right adjustments. Nothing magic. ForzaTune Pro does the math for you, and makes it easy to customize a car to your driving preferences. If you tell it you're driving a GT350 on Laguna Seca, then it will create a tune accordingly.
Download the free setup package of ForzaTune Pro 4.0.3 and have a look at users' reviews on Droid Informer. The app runs on Android devices 4.4 and higher. This download is totally safe. FlameFront Studios is the developer of this application which can be found in the Tools category.
ForzaTune Pro has been downloaded and installed by over 10K users and its latest update is dated Sep 23, 2020. The app has been rated 4.4 on Google Play.