In theory yes, it's possible a pressure spike might mean even more than that, but the closed blade should be strong and there should be little real strain on the shaft itself. And that's if you choose to fully close the blade at high rpm ( DBW gives you options here )

There are considerations and options all round. It probably does make sense to run a valve, whether one or two ( or more ) is irrelevant as ling as they're sized and positioned to do what you think they need to do. Some may do two purely for aesthetics, rather than actual function etc etc.

But in general, it probably is best to have some sort of escape path for boost on closing or even modulating the throttle at high loads.

 

 

 

You don't need hot water in your house either, but it certainly makes life easier on the more sensitive parts. If you run a manual transmission you need a BOV. If you drive hard on the street with an auto, you need a BOV. The only thing that is fanboy **** is the ones that are specifically designed to make some stupid noise when you let off the throttle. There is absolutely no legit reason to induce a severe pressure spike into your intake tubing every time you lift the throttle. That is just begging to blow some connections apart.

 

You can run a BOV if it makes you feel better, but you don't need to....
Just like you don't need ARP rod bolts in a SBE