There is a write up on making a boost activated dump control. That's the way I want to go. Run 1 line to an old wastegate actuator and have it push open a butterfly. Same concept as the electric dump, only boost controlled. I found 1 place that makes and sells them but they are like $400. Pretty simple to make on the cheap. You can have it start to crack open at about 7 lbs. Nice and quiet TILL the boost comes on! Imaging the thoughts of the guy racing you, it'd be quite the change in sounds as you scream past them. Ah, save that for the fish kill section.