If you want an extra ecu for the GT, a extra one is about $385 on this site. I have read when you re-flash your ecu the date of the last time it was flashed is stored. If this is true and you want to maintain the factory date then a spare may be useful.
BlackICE
http://www.ecudirect.com/finditfast/
BlackICE
http://www.ecudirect.com/finditfast/
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