Can there be checkpoints added into the car chase intro because it is ridiculously difficult to pass all in one go. The enemies practically snipe you with whatever gun they have and you only have 3 med kits at use. After that, you have to rely on health regeneration which is not very reliable since everyone is shooting at you.
I only play on hard... thats the only really "HARD" part of the game. Eventually you'll get through. Try to shoot people early on (like when the first car starts chasing, take him out fast (before the first turn for instance by just shooting his tires or headshotting the driver) - early / preemptive killing does the trick. Good luck.