I have a 99 ws6 and was thinking of narrowing rear I really want a deep dish in rear I have a guy with a set of prostars that are 15 by 10s wit 4.5 bs in rear so I was looking into it would it be ok to get 3 inch off each side to make that bs work ? And whats a good pice to get it done also. I have the 10 bolt rear should I upgrade rear before so ?