A lot of you guys here are saying that a solid rear axle is better for drag racing. And adding drum brakes to replace disks is a good thing. Ok, whatever...
But the last time I drove my Mustang in a drag race was... um, never!
I'm not 17, I don't drag race my car. My Mustang is my daily driver, and personally I would prefer an IRS over the solid axle any time. In real-world, normal driving-the kind of driving we all do 99.99% of the time, not the driving we wish we did or we brag about-I think an IRS performs better.
But that's just my opinion.. I could be wrong!