I've played a demo of this game or a Shareware version, I never had the full game. It was on one of those 1000 shareware games CDs. It's a top down racing game with a gritty sort of vibe, a bit dark. As you raced there were pickups and bonus items and I'm pretty sure you could fire weapons at other racers. It was a single player game. It was top down in that semi 3D kind of way, but I think the cars were meant as full sized cars, not a micro machines kind of thing.

The one unique feature that never let me pinpoint exactly what game it was, was this very specific sound effect when getting a certain pick up. A voice would say "Booster", but it was pronounced more like "Boostah".

There were jumps on the game and one way to kill other racers was to jump on top of them. I think the track had multiple routes you could take.

I think because of the shareware version I had I only had one track, which was kinda dark, like maybe a cave. And the surroundings were rocks. I think there were also thinks like oil barrels with fire in them and pretty lighting effects for the time.

Very similar to Death Rally, but maybe a game inspired by Death Rally? Because that game was earlier I think and doesn't have the distinct "Boostah" audio clip.