I'd like to substantially stiffen up the suspension of my E46 M3 since it's main purpose in life will be track time. On another forum someone is selling a set of Bilstein PSS9s with 30k miles on them for about 60% the price of new. Anyone have positive experiences buying used suspension?
Second question - I don't need coilovers because I don't care about lowering the car that much but I do want stiff - suggestions?

