How I'd improve the Car Chase Scene
First off, its already pretty awesome, but here's how I would have made it better.
Instead of Mike and Marcus hopping into the Ferrari to chase down the Haitian gang members, I would have had Mike and Marcus get split up during the earlier gun fight and have had Mike hop on the back of the truck with them, meaning Marcus would have had to try and catch up to them using Mike's Ferrari. Have Mike fighting henchman on the truck and during the fight bump into the lever that releases the cars off the back of the truck. I just think it would have been pretty awesome to see Mike freaking out about Marcus trying to dodge falling cars in his Ferrari while trying to fight the bad guys. Maybe have it so that one of the guys Mike throws off the truck hits the Ferrari and then afterward or during they blame each other for whose fault it is (mike: you should have dodged him. Marcus: you shouldn't have thrown him)
Just an idea I had.