Long time BMW driver here, wanting to finally try autocrossing. We have an E36 M3 in the garage and from the posts it looks like it's a great car to autocross. Any thoughts on the E46 M3 for use in autocross? Anyone try an E39 530i? It seems like the later model 3ers and 5ers aren't as optimal because of the overall weight/size gains and use of less robust materials.