I have the opportunity to pick up a low mileage '04 Cobra IRS that has been pretty beefed up (came out of a car with nearly 800 to the wheels).
My question is... What out of these pictures do I and don't I need? Car will be utilizing some type of coil-over suspension in the near future as well. The current rear is the factory TII that came in the car and is being built for nothing but road racing... So I figured the TII isn't going to withstand the test of time. (...or is it...?)


And also, what's the general price range for these? And what could I sell my TII diff for?
Thanks!
-Tyler