Are 1G turbo injectors bigger than 1G NT injectors and if so do they fit right up to the NT model??

They are bigger, and I think they will fit right in...it is the same motor, turbo is jsut a little beefier in the chambers.

I think N/T's have 210cc inj while the 5speed Turbo has 450cc's and the Automatic Turbo has 390cc's The injector housing is the same size, but you'll need an AFC to use them. If you can get your hands on the injectors from a N/T 3000GT, I think those are 290's or 310cc's which would be easier to tune in a N/T DSM. They bolt in too.