I'd go bigger gear if they made a lower 6th gear for the 3160. 390's wasn't worth the hassle and 4.30's seemed a little crazy without lowering 6th. I'd love a .50 6th gear option to compliment a set of 4.30's. On a side note, long trip from Tampa to Miami yesterday and did a 4th gear drop and rolled the tires over (with the stock 3.73s) in the rain. And that's with 325's out back. These cars have torque, you just have to be in the proper rpm/gear to wake it up.