Dang, this thread doesn't appear to be active anymore :<
Attempting to revive...(?)
You can use your car as a turret! Plonk it on a rotary platform like the ones they have on train lines and things like that, load some ammo in the back seats (possibly with an extra person to help you load your "cannon"), and you can just fire away to your heart's content!
New power: You have a massive set of helicopter rotor blades on your back. However, they can't lift you up for shit, and there's no way for you to reduce their size.
AlsofirstposthereyEEt