Performance Boost xB owners asked for a more powerful engine. Scion ... generation. It is available with a five-speed manual transmission or four-speed sequential shift automatic, a first for ...
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Boom Supersonic's XB-1 smashes the sound barrier — becoming the 1st civil aircraft to go supersonic in US historyBy achieving a top speed of Mach 1.1, Boom Supersonic has broken records and is on course to revive supersonic passenger travel.
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