BF

BF is an automotive manufacturer in the HD Universe of the GTA series.

Overview
Based on the design of most of its vehicles, it is likely based on a Volkswagen cars customizer. BF may be a division of Vulcar, wich is the GTA World counterpart of Volkswagen.

Trivia

 * In GTA San Andreas, there is a buggy called BF Injection, but in GTA V, it's only Injection, being BF the manufacturer.