turbo is easy as people have said
be bolted skyryans turbo on in my shed, took us about half a days worth of actual work
we spent the rest of the time making out and what have you
the injectors, i would get done as they are fiddly an its just worth paying someone else to do it
again what has already been said, sell the greddy and buy a pfc or one of the new v-ipecs, not just a piggy back
that way the tune will be better, and it all comes down to the tune in the end.