If I am using the haltech computer can I use the stock 550cc primary injectors and bosch 1600cc secondary injectors? and what do I have to do in order for them to work good as to using resistors ect.

 

Yes you can and you don't have to do anything. In the manual I believe it states that you can run different resistance injectors as long as they are on a different channel. I am doing exactly that right now, stock high impedance primaries with 800CC low impedance secondaries. Just following the wiring instructions on The Hitman's site for the injectors or just plug them in if you have a flying lead harness.