The problem with a irs is the 1/2 shafts. The 3'rd member can be built to be quite strong using methods not usially discussed on this site though. When a 1/2 shaft breaks at speed you will have sudden right/left turn and bad things happen real fast. I thought a few years back that the new CV technology (over U-joints) might give us some new ways of handling high torque, but so far nothing I have seen has convinced me otherwise. I'm not the only one that has recognized this problem. For example the NHRA requires higher horsepower/classed cars to use live axles even if the car came with a irs from the factory. They are also having problems with cars such as 500 horsepower Vipers, Mustang Cobras, after market Corvettes and the like right now. (factory cars)
I'm not even going to get into the problems with stick
transmissions and your options, together with blowers on comp. cars.
On street cars though, most of the stock stuff out there will work "FAIR" if a little common sense is applied. But I ask you, is Cobra ownership a good common sense judgement in the first place? And you want to add a blower!
cobrashock