I have the Xcharger with the automatic. I put it on last in a series of upgrades in search of power. Started with a CAi and tune,headers,dual exhausts,LCAs',Aluminum D/S,Tloc and 3:73's(in the stock rear end)and Xcharger. I have been to the strip last year and ran in the high 13's and driven the Same car Across America with The Mustangs Across America Group.
Maybe I have been lucky or not but never a problem with the rear end.
I have a new Tru Fiber Hood and GT rotors up front
I have front brakes for purported better stopping,havent realy noticed a change..
Next and LAST is a cooling mist wetx injection.
sooo if I were you I would just get the xcharger 1st. See how things go and replace or up grade as needed. All these other goodies are just icing on the cake.
but it is better to lay dow two 100' strips of rubber than one
