if you want technical help go to a search in the forums at
www.i-club.com . this has to be the easiest thing to do, there are 2 screws that hold the stock bov in place, upsrew them and put the new one you got on. the instructios should be pretty strait forward. did you know that a BOV on a unmodified stock wrx is hurtful to performance? you should do some resarch could be money better spent elsewere. good luck with whatever you decide