Your list has a bunch of useless stuff. And the drag and rev hard kit come with an intercooler and piping. 2.25" will suffice.

Hondata is a piggyback that controls the ecu. When you add fi to a honda motor you are going to need to tune it. More air, fuel, heat is in the motor.

Dc2 mentioned the p28 because it is a very common ecu to use with hondata since you have to convert to an obd1 ecu for hondata.