hey everyone,i just bought a 2006 520i,and have the factory 16'' alloy rims.i wanna change them for better ones.should i remain on the 7*16'' or can i change them to 7.5*17''.

my car is a 2.2L, 170hp. will an increase in width and R'' affect the performance greatly? meaniing will it show a decrease in performance,will i feel it? what do u guy adivse me.

PS: how much can i sell my factory rims for?