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There are quite a few Bmw Coupe Models that have the option of a convertible top. The 3 Series Cabriolet, the Z4 Roadster, and the 2011 BMW 1 series are all available with the convertible top option.
Press and hold the "top" button on the console.
I'm affraid that carmax don't sell BMW Z4 Roadsters. They sell other kinds of BMW Z4 though, including convertible types. I think it will depend on if they can get any in second hand.
There are several different kinds of BMW convertibles and their cost varies dependent on the country it is sold in. A BMW Z4 can be found at 47000$ but a BMW M6 is at 115000$.
160 mph
The 2013 BMW Z4 has 16 valves.
The 2006 BMW Z4 has 24 valves.
The 2007 BMW Z4 has 24 valves.
The 2012 BMW Z4 has 16 valves.
The 2005 BMW Z4 has 24 valves.
The 2009 BMW Z4 has 24 valves.