You're going to have to do both, wastegates and bov's serve very different functions. A wastegate bleeds off exhaust gas before the turbo to regulate boost levels. A bov vents off air when the throttle plate closes to prevent damage to the turbo. Can't really use a bov to regulate boost. Well, I guess you sort of could by setting it really loose and having it leak while boosting (I did that on my old Vortech SC setup) but it's not really effective.
But a bov would never be able to consistently regulate boost pressure.

Quote Originally Posted by Retro
Im new to the whole turbo thing, so i was just wondering if on a turbo setup do you have to you a wastegate to prevent over boosting or can you just use a bov?