ok so the other day I was playing with my kids and we came up with some abilities for the cars themselves. We playtested an entire 2 games with these rules so you could say that these are basically untested.
as i dont have the cars in front of me I might have some of the names wrong.
Banzi - May discard an armor card along with a weapon card to apply the damage of the weapon that is stated on the armor card, as a ram. IE you discard a left armor and a front Flamethrower to do a 6 damage (same as flamethrower) to the left. This damage is considered a ram and can not be avodied with anything except a swerve or spin.
Piranha - Each armor card provides 1 extra point of protection
Scambler-May hold 8 cards in hand
War Hawk- may make 2 attacks each turn. may only use MG's
Hot shot- All flamethrower attacks may be "called". IE you may place a any flamethrower on any side
Hammer- after making a regular attack may make an extra attack each turn if its a missle attack on same target (may be different side)
Im sure someone else can come up with more stuff. This only took us about 10 minutes to do. Have fun.