Yeah no problem, you do need DS4Windows though to spoof it as an xbox controller. Once you've installed it, click the profiles tab, set a new profile up and use the Xbox 360 default. Also go into settings and tick "Hide DS4 controller" (It's the first tickbox), then just remember to open it up whenever you want to play Forza.
I've heard many of you had problem with launching split-screen mode so I decided to make a quick 'step by step' tutorial in which I show how to make it work
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