Leeper, your logic is like going into a car dealership and ordering a car one part at a time, it's going to cost a fortune. Were a complete set of throttle bodies for a GSXR including injectors, fuel rail, tps and pressure regulator will probably cost $100, checkout http://tinyurl.com/2eqlbcu for an example. Your best bet is to find something that can be adapted to suit. I am sure there are a ton of web sites then people have installed fuel injection on your motor. One other comment TMW are a real high end supplier, good stuff, Haltech not so much, not a high end unit, there software is not know as being flexible and or easy to use. A set of throttle bodies you can adapt and a Megasquirt will work great. I run a Megasquirt on my Turbo Miata, works great checkout http://www.diyautotune.com/. But if you want to go high end TMW and say a Motec ECU would be perfect. Jenvey have a great reputation send them an email and see if they can help http://www.jenvey.co.uk/.