Hi. I have an 86 Mustang that I put a panhard bar into. A guy I know is selling his IRS out of his Cobra for 700.00 that he says is in perfect shape. I do know that his car goes mid 10's. SO I am wondering if this is a good price and what tends to break on them, and what I should look for as far as problems go when I go to take a look at it? I am into Auto crossing, not drag, and was going to do a Torque arm this spring, and need my rear diff fixed as the clutch packs are shot, so this will be about the same price as the IRS. Also, anyone know of someone who put an IRS into a fox, and how much of a pain it was?