you can also "crush" your stock BOV. just use a c clamp and crush from top to bottom about 3-5mm. this increases spring pressure which allows it to hold more boost.
I know a guy who made 450 whp on a FWD Sr20det with z32 maf , 1000cc inj, stock ecu and SAFC2.......I wouldnt have believed it , but i have seen it myself.