Answers: Yes, they are 100% legal. Assuming obviously they aren't loud enough to violate any rumpus ordinances contained by your city. :) You'd need a signifigant amount of boost and what's call a trumpet BOV for that though. Even then, you'd hold to find a police officer actually feeling like to enforce that law..
Hope this help, have fun tuning.
Yes blow stale valves are legel they hold nothing to do next to emissions at adjectives. Blow off stopcock prevent pressure surges in the intake when you are beneath high boost and permit of the throttle fast.
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