Amp, Spira, Tango and Tata Motors all bounced from X-Prize competition Friday

After the first week of the Progressive Automotive X-Prize's Finals Stage, some of the better-known teams will have to say good-bye and watch the rest of the competition from the sidelines. According to a new press release from the AXP, Tata Motors, Amp, Commuter Cars (Tango) and Spira are out.