Ian, fantastic spec, and it certainly works extremely well judging by that graph, and i bet (not shown on the graph of course) that as well as a slightly better spread of rpm being on boost that the lag when you nail it at say 4krpm from a slight thorttle is also less than a standard T34?

I really wish id gone down that route with mine rather than buy the T34 now to be honest.

I assume that the t34 mods to the GT28 are largely responsible for it flowing more than one would expect?

Who did the work?
Or is it DIY?