Wow do you think you could be a little bit more specfic? Are you sure you are a mechanic? HKS produces turbos that make anywhere from 300hp to well over a 1000hp. So if you are going for the T51R, which I doubt, you'll need bigger injectors and a whole lot more. As for the injectors go, it isn't a matter of them fitting, it's the impedance of the injectors that matters (i think). I'm not very familar with GTRs and the amount of hp they can support so someone with more knowledge will have to respond. So how about giving us some more info on that turbocharger or chargers you are planing to get.