Thinking about ordering my kit tomorrow but had a couple questions. It will be going on an 04 2500HD 6.0/4l80e, I have cai,exhaust and hptune. Have any of you guys used there upgrade injector kit or fuel pump? I will be upgrading to their 76mm turbo, I only want 6-8lbs as of right now. Is it a must to put in springs or anything right now? Any help and or direction would be great, thanks guys!