It has been announced by Criterion Games' Matt Webster that the Boost Specials will be released on Thursday, March 12th 2009 for PS3 and Xbox 360.
The Boost Specials include the Extreme Hot Rod, which features a locked boost and the Hawker Mech which features a switchable boost.
Pricing for the cars have not been announced. More information will be provided as it becomes available.
Matt Webster's Twitter Page
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