In addition, the Steyr AUG is also in the arsenal.
Beretta 92FS
Police officers who find Jensen in his kitchen are seen with Beretta 92FS handguns.
Sawed off Double Barrel Shotgun
Warden Hennessey (Joan Allen) keeps this weapon under her desk attached to a spinning mount so she can aim it easily at whoever is standing in front of her. She does this when she told the guards to take Jensen's cuffs off..
Twin M134 miniguns are hood-mounted on the passenger side of "The Monster". Coach (Ian McShane) mentions that they are "30mm machine guns", but in reality the barrels reveal that they are the miniguns that fire 7.62mm rounds. (They probably meant .30 caliber machine guns).
MG42/MG3
Frank has three bonnet-mounted in the beginning of the movie. These were replaced by the dual miniguns after the Monster was destroyed by an RPG from Machine Gun Joe. Interestingly, the Monster is one of the lightest-armed vehicles in the movie.
Fuel Tank
While technically not a gun, it is used very ingeniously by Ames to get some guards off his tail.
"The Tombstone"
Six-inch steel rear armor plate that, combined with high speed, becomes a useful projectile. It is also claimed that .50 caliber bullets could cut through it in seconds, which is highly unlikely, they'd more likely scratch it. Used by the original Frankenstein (David Carradine) in the first race and Jensen Ames at an attempt to take out Machine Gun Joe Mason (Tyrese Gibson) out of the final race.
Two are side-mounted on Machine Gun Joe Mason's (Tyrese Gibson) Dodge RAM.
Browning M1919 Machine Guns
Four are hood-mounted
RPG-7's
Six are roof-mounted for the final race. They are used to blast open the hole for their escape. Lists (Frederick Koehler) says they're "Model 7 Russian State Armory RPG's. Armor-piercing, self-arming, accurate at 2000 yards.This in truth is a lie since an RPG has a 45% of accuracy at 500 meters"
Four MG34s are hood-mounted on Pachenko's (Max Ryan) car with two PPSh-41s on the radiator grill and twin Uzis in the grill. There also appears to be a barrel of some description coming out of the boot of the car, most likely a machine gun for defence.
1980 Porsche 911
Driven by 14K (Robin Shou)
MG42/MG3
Has two grill-mounted on passenger's side.
Rocket launcher
Cluster of four grill-mounted on driver's side.
Two clusters of two where rear window should be.
Driven by prison guards. This is a semi fitted with numerous firearms for offense and a cow-catcher, armor-plating, wheel spikes and even spiked rear chains for defense.
Various flamethrowers
Mini gun
Browning M2
Modified M 202 FLASH missile launchers(6 barrels instead of 4)
Possibly an M1 Abrams turret with a 105 mm main gun(no pic)
Pontiac Trans AM
Driven by Carson, he has a roof mounted Browning M1919 fitted with turret shields and spade grips which is operated by his navigator and a rearward facing GE M134 Minigun for defense.
BMW E32
Driven by Siad, the BMW is also one of the lighter arms vehicles with a single GE M134 Minigun with a flash suppressor. The entire passenger side of the BMW has been chopped off and replaced by the Minigun.