Tuner kit will include everything you need minus the fuel/tuning. Every bracket, pipe, hose, tube you need is included. If you want to save a few dollars go with the UPR boost pipe over the Anderson piece. Personally the T rex is the way I have gone in the past but I've seen several cars more recently running a single 340 pump without issue. It's a personal preference at this point you'll be fine either way. Your current fpr will work for you without issue and a competent tuner can burn an SCT chip for you on the dyno.
Have you got pricing on the V3 Si tuner kit yet? If you haven't ordered give me a shot a quoting you on it, shoot me a PM