From some of the posts I've read on the fto forum on smartgroups this car ain't all that great in terms of reliability and quality of work. I believe it was at santa pod (or somewhere) and didn't run the 1/4 mile... wonder why. Also Calder ("apparently") didn't develop this - they imported it.
i know they imported the gr and claimed it was a development by their calder racing development dept but i heard nothing about the turbo-ed gpx... i emailed them to see what kind of prices they are charging for their turbo kit, we'll see what they come back with!