That's where the BMW Z4 M comes into the picture. BMW built an M version of the Z4 from 2006 to 2008. Just 3,042 convertibles were built for North America and only 1,815 coupes. Although the convertible is also a good car, the more exclusive coupe is the future collectible to buy. Powered by the same 3.2-liter S54 inline-six engine as the E46 M3, the Z4 M coupe could hit 60 mph in 4.7 seconds. The S54 produced 330 horsepower (just three less than the M3 due to a shorter exhaust) sent to the rear wheels through a new (at the time) six-speed manual; the E46's transmission wouldn't fit the Z4. Aside from the engine, the Z4 M borrowed the M3 CSL's aluminum hubs, cross drilled iron floating rotors brakes and most of the suspension components.
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