ok so after taking all this info in, i've decided that i am placing my BOV before the cooler only because it makes it alot easier to plumb it back. the way i have riged it up is the bov well be in an enclosed box where the air filter is housed keeping under bonnet temps out, also the cooler and air filter piping to the turbo have been wrapped in heat resitant tape, hopefully this well help keep the air going to the turbo fairly dense.... also im sticking with my stock bov , it does a good job , sounds good and is legal too.