GReddy x Voltex Rear Diffuser | 2022 Subaru BRZ/Toyota GR86 (17510235)2022 Subaru BRZ Toyota GR86 Rear Diffuser by GReddy x Voltex This is the Greddy x Voltex Rear Under Spoiler. This component much like a vortex generator has been designed to generate an exit path for the air underneath the vehicle. This will help generate more downforce as the vacuum under the vehicle will help pull the chassis closer to the ground at high speeds. Additionally, this will provide the exterior with race inspired looks for enthusiasts