yup what everyone else is saying. An AWD car still has two wheel steering and four wheel braking just like a RWD (or FWD car for that matter) if you want to improve steering and braking you have to improve the tires. AWD just means when you stuff it in the weeds you'll be going faster :/
My old 944 went from undriveable to a beast with winter tires. I'm hoping for the same effect with the 335i. I already put the Blizzaks on it on Saturday, wish me luck!