plz help Air filter,BOV :(, I got a Rav4 GT4 (i.e; i swapped an st-205 in my Rav4:p) Options

[Rav4Race]

Well after lots of pain to fit, wire up, tune, fine tune, i still have some more works to complete:(
Thats life, n as ive invested much money in that project i have no choice but to face the troubles...

As u can imagine, since ive moved that huge engine (3sgte st-205) into that limited space of the Rav4, i have
to make sure each space is being used efficiently. My main problem: my clutch is slipping. I opted for the exedy tri-puck semi racing clutch, hope ive made the right choice (will install it next week).

The BIG problem now is that i could not keep the original air filter box (too big). Is it ok to use the KnN pre oiled direct air filter? Ive learnt that HKS filter is not that safe coz after some time it might desintegrate and get stuck into the turbo.

There is a plug that came into the original air filter box, i think it is used to measure the amount of air intake and since am not using the black box i dont know where am going to plug it plz HELP!!!!

How about the original BOV which came with the box? Should i replace it? It is not being used as a recirculating anymore, but i feel that it cant hold all the turbo pressure. Its too soft. Am i gona loose power if i use another BOV? how can i get it to be a recirculating one with a direct air filter?

PLZ help me...thnx