I think you got your answer in the latter part of your post. Get what you need or what will be most conventional for use before you start adding the things you want.
Myself, I would probably go with exhaust first, only because I don't drive my Mustang but a couple weeks out of the year and to me sound = pleasure, but if limited slip is something you feel the car is lacking, I would say go with that first.
__________________ 1967 Mustang GT Convertible: Edelbrock Headers and Carb, Strut Tower Brace, Front Disc Brakes, Everything else ORIGINAL 2006 Infiniti G35 Coupe: NISMO CAI, NISMO Braided Clutch Line, Tein Hood Dampers, NRG CF Engine Cover, Vortec SC comming soon |