I have the Mach in my taurus and my dad has the Mach 460 in his Mustang. His has more wattage (460 watts vs. 200 watts). The Taurus Mach system WILL NOT allow you to distort the sound waves. It only goes loud enough to sound good. The Mach 460 on the other hand goes louder and has alittle better bass, but will distort at higher volume levels.
The only real significant thing in the Mach setup is the tweeters, imo. I have the "base stereo" in my mustang and I added the Mach 460 tweeters to it. It really helped the highs and the aftermarket non-amplified speakers sound better than either Mach setups, imo.