if you were to hook up a vacume on the backside of it like a real bov it might be posibble

 

hmmm that bov steve made looks awesome.
Hmmmm maybe I can make a HMT external wastegate with that radiator cap Idea I have like 2 rad caps here,
hmmmm it seems possible though I'll try to make on
The rad cap spring should be cut in half and stretched probably