..........just about every factory produced vehicle came out with a blow-off valve (actually, the proper term would be compressor by-pass valve). Just that they came with recircualting ones that dont vent to the atmosphere, hence a very very silent "pshhh".

Bosch made most of these. They are black, and take compressed air and re-route it to the intake pipe post filter normally (in MAF sensored cars) or pre filter in MAP sensored cars. They are a factory item in: Saab turbos, 911 turbos, Nissan RB20/25/30/26, CA18/ ET15, among zillions of others. Two of these from a wreckers will set you back $30. They work, are stealthy, and cheap.
You'd be nuts not to put a decent BOV on that new hybrid. You dont have to go the gay noisy ones (frankly, they draw to much attention and make you look a ricer), there are some fantastic stealth versions out there.

The race car aforementioned is fitted with either a pop off valve, or uses an external wastegate mod to vent the compressed air when throttle plate is closed. What kind of race car is it anyway? Sounds like a V8TT sprintcar.

Compressor surge sucks.