Which Tune for Injen Intakes, FI LTH and CBE

RCZ

You don't need a retune for those mods. The car will run a bit lean, but I personally don't think its enough to cause concern. The tune will fix it yes. Uprev is tuning software. You have to buy a license from UpRev and buy the tune. You can then install the tune into your car.

Honestly, I don't think those three mods will lean out the car enough where it will be a big issue, but then again, thats my opinion. It doesn't sound, from your choices in mods, that you are very tight on money, so if you CAN get the tune, definitely do it...someone else had very good results with it.