Depends on the amount of boost, volume needing to dumped when the throttle closes, etc, you may be OK not running one... but it's always a good idea to have one. A BOV is pretty cheap insurance for the turbo, so there really isn't a good reason not to run one!
Argument on the flipside though: Buick GN's didn't have a BOV from the factory and the factory turbos could last years and years and well over 100K miles with zero problems. Then again they had an automatic tranny so you're not stacking up the air on every shift as you would with a manual tranny and their intercoolers and total piping volume are rather small so they didn't surge all that badly in stock form if you snapped your foot off the throttle when at WOT.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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