Skills starting to unlock now, there's a lot to upgrade - combat-wise there's 15 combat skills to get (chain finisher & weapon parry are the only two unlocked at the moment), plus there's a few jacket upgrades, wrist-armour upgrades, ammo capacity upgrades, knuckleduster upgrades, a few extra tools to acquire and different styles for Max's hair & beard. On the car side of things you can upgrade the ramming grill, armour, engine (v6 and later v8), exhaust, tires, suspension, boost, rims, boarder spikes, sniper rifle, harpoon, thunderpoon, side burners, upgrade the repair speed, add hood ornaments (that bestow bonuses), switch the body between one of five choices, plus decals and paint.
In addition to the combat stuff I mentioned earlier, you can pick up melee weapons that enemies drop, but they break after continued use. There's also 'Fury Mode', which kicks in after chaining together combos without being hit and lets Max use more powerful attacks.
Here's a few screens. Witness!!