As mentioned they are a must have on any forced induction setup. Otherwise you will get compressor surge as you are in a best case scenario or break something on hard decel as a worst case deal.
I use a lot of Forge BOV's and recirculation valves depending on the application. They are billet aluminum and can be setup as a release to atmosphere or reciculate if used behind a MAF sensor. For install they can use either a 1-1.25" nipple to go on a hose, a weld on fitting or there are a couple flanges available.
I am trying to attach a couple pics. Prices are genrally $125-175 shipped in the lower 48. Hope this helps.
Mike Norris
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