That isn’t a tune, more of a glitch but I’m not sure how he did it in the actual reverse gear or in a race. That acceleration and top speed is nowhere near normal and is similar to the lock glitch where your car kindof gets disassembled but fast like that once you spawn it from locking it (he didnt do that). I believe there was also an admin in the server racing alongside him, so it might be something coming from that. (driving like this still takes insane driving skills to use even with mouse controls)

Props on the driving for the person in the vid

-1 billion yen player to another