I remember there was this game I used to play on my OG XBox all the time. It was a game where you drove around in these car/tank things picking up powerups and destroying other cars/tanks. I played this all the time and remember I loved it, but I must have sold it or something a long time ago because I don't have it anymore. Does this ring a bell for anyone? I know it's not much to go off of. I just remember you would select a certain type of tank (big, small, different type of weapon) and would drive aroung in different stages trying to defeat all the enemy tanks. It had a co-op mode because I remember playing with my friend also. Does anyone know what this game is? If I remember anything else about this game I'll post it.

EDIT: It was BattleTanx: Global Assault for the N64. My memory completely failed me on the system lol. Really sorry about that everyone. Thanks to everyone who looked and thanks to Farsala for guessing the game.

Vigilante 8?

Pretty sure the answer was already given but I want to show off my knowledge and say WWE Crush Hour.

Steel Battalion? (I did a quick google search and found that).

Nope, it's not Steel Battalion. Did Vigilante 8 ever release on the OG XBox? I just looked it up and it looks like it only came out on PS2, Dreamcast, and N64.

Yeah I was gonna say why are people thinking Vigilante 8 when it doesn't even say it released on the original Xbox in the first place.

Cel Damage maybe?

Didn't Wreckless get Tanks in later stages? That said, no co-op.

Other ones I can potentially think of are:
Crush Hour as d21lewis said.
Smuggler's Run 1 or 2?
Cel Damage?

What sort of graphics did the game have? Realistic or Cartoon (Cel Shaded?)

OK so if not vigilante 8, twisted metal? Off the top of my head?

WWE Crush Hour was only on PS2 and GC.

The vehicular combat games with weapons on Xbox seem to be Mashed, RoadKill, Cel Damage, Starsky & Hutch and 187 Ride or Die.