will depend on the type of fuel you will be running. If you will be using 93oct 99% of the time go with GT 550s or something similar, that's going to be a lot more fun. If you will use E85, there is no reason to go with anything smaller than the GTX2860 Gen 2 and at that point you will need two fuel pumps and top feed injectors. Money will go fast but so will your car. No matter what, do all the breather mods first, is almost a requirement with bigger turbos.