After some information reference Meth injection

Would like a meth kit on my car at some point [ namely when the vac leak is sorted via G5 board hopefully ] and have a few questions.

Is it better to buy a kit from one supplier aquamist or BMS for example?

Would building a kit specific to my needs be a better option?

Would i have to get rid of the BOV if I bought a meth kit?

cheers