The BF-Injection is a rear-wheel drive, two-seater dune buggy. Interestingly it has license plates so it is road-legal. It's fun to watch the flywheel spin!
There are several spawn points. One is near the snake farm to the south west of the Verdant Meadows Airfield. One is on the beach to the southwest of San Fierro. One will spawn near the stadium in Las Venturas when you have completed the challenge.
More info:
gta.wikia.com/wiki/BF_Injection
https://www.grandtheftwiki.com/BF_Injection
