Just got a 1999 mustang GT anniversary edition.this is my 1st mod motor i have had many many 5.0 cars.Its an automatic car and stock.getting ready to do a few mods.already ordered exhaust and cold air kit.what gears should i run in rear?any other mods you suggest?want to get it in high 13's and just have some fun with it while im working on my 91 GT to get it back out.