4.6L n/a Mustangs are not really that spectacular. They CAN be fast, but after some mods, just like any other car. However, the sound that motor makes is orgasmic. Its deep but hollow and really aggressive
Like Tony said, they are heavy as well. The Cobras and Mach 1's are the only serious mustangs out there.
As for the old 5.0 litre Stangs, a few mods and you are flying