Mike VRO on Twitter: "I can confirm the Vive Facial Tracker does work with the Valve Index when using a USB C adapter! You just have to be a bit creative with
People Are Modding Fans Onto Valve Index To Keep The Headset Cool
Valve Index VR Headset Sets an Impressive New Bar for VR Fidelity
Valve Index review: Next-level VR | Engadget
Valve Index review: high-powered VR at a high-end price - The Verge
Is Valve Index Still a Good Choice Today
Since it's so popular now, here's my theory on the expansion port : r/ ValveIndex
Valve Index® Replacement Tether on Steam
Controllers feel great except for USB C port which doesn't seem too secure : r/ValveIndex
Valve Index review: Currently the best PC VR headset?
10 Things You May Not Know About Valve's Index VR Headset | Tom's Hardware