My opinion buy a sprint booster or pedal commander first. That should be your first mod. If I could redo my mod list, I'd go a sprint/pedal throttle mod first.

My first mod was a DCAI and it did give me more power and increase the blower whine, however about 2 weeks ago installed a pedal commander and I said then I should have done that first. The throttle lag on a crossfire is atrocious.