08/08 works for me, look 1 row above the horsepower code,Look in the guide code guide to the right, it will be (..#.%..or similar to that, it's always a character(%) dot(.) then another character(#). be sure you have racing suspension, put everything to the far right(this excluded camber unless you have a wider chassis) then go into HxD and edit the stock ride height to 01-10. depending how slammed you want.