another option of keeping the stock bov is getting the apexi. the kit is very inexpensive, and comes with the hardpipe that goes into the throttle body and the bov bolts right on it. i used to have it and had no problems with it leaking like some people have, you just have to adj. it right. your best bet would be to get some hardpipes or a fmic with hardpipes and get an hks bov and flange, hks has the best design as far as not leaking at all. this way you can run it in conjunction with your stock bov, i went this way for a while and loved it.