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Hyper Function Suspension (HFS) is a suspension and automotive parts manufacturer in Grand Theft Auto Online.
HFS is (based on its name) a suspension manufacturer in the HD Universe of Grand Theft Auto, Hyper Function Suspension is mostly seen on racing related vehicle liveries as a sponsor for several autosport teams in Grand Theft Auto Online.
The company appears to be based on several suspension companies and tuning parts manufacturers like HKS which is what their abbreviation appears to be based on. The border around the logo might be taken from Öhlins and the text style from TEIN featuring broken up capital letters, and the Name "Hyper Function Suspension" might be a reference to TEIN's tagline: "High Performance Suspension".