Hi, kind of new here but I have some tuning/build issues and concerns. Here is my layout so far.

JDM B20b 96 moddle (lowest compression no nock sensor) all stock.
I will be putting in,
Stage 3 turbo cams
T3/t4 turbo with 3" piping
26x30x4 intercooler
750cc injectors
Possible use of nitrous I'm not sure just yet.

I have made a few tunes for the set up but my real question is, do I need the 70mm intake, or can I get by with my stock 60mm intake? And what fuel injector size should I use, and when does a t3/t4 turbo start to kick in as in rpm range. I'll upload my best tune in a little bit. If anyone could look at it and give me pointers that would be great. I'm running crome because I don't have a lot of money and I wanted to teach myself how to tune but I am scared to waste a lot of money on this build lol.