I finally got around to ponying-up the $170 to get a Hyperboost diverter valve for my car. Eight months of research (and procrastination, admittedly) finally led me to conclude that my stock diverter valve was blown. (giggles) Yeah, the stock diverter was definitely blown. I think I'm going to be getting a speeding ticket in the near future. I have to say I'm quite pleased with the Hyperboost diverter. From what I'd read, it was Stratmosphere's version of the Forge diverter (they were Forge's first distributor, someone said) with a few design changes that Stratmosphere wasn't able to talk Forge into implementing. I don't know what those changes were, but it's definitely an effective piece of equipment. My car feels 50,000 miles younger now. After administering the time-honored "blow test" to the stock valve, I realized that the diaphragm had failed -- the standard mode of failure for the stock diverters, apparently. How do I know this? Because when I blow into the side connector, air comes out through the vacuum connector. That's not supposed to happen. I could have sworn it was jammed in the open position, but instead it turned out to be the fourth vacuum leak on my engine that I've discovered -- and the techs at the dealership completely missed it. I should just give up on car mechanics, I swear. If only I could find one that would fix what I tell him to fix, instead of trying to second-guess me. ...and yet, questions remain. Looking at the way the stock diverter valve was mounted (and I attached the new diverter the same way, no worries), I'm puzzled. If the diverter valve is supposed to be a pressure release, shouldn't it be mounted so that, in the case of a major overpressure, the air mass downstream from the turbocharger could force the valve to open even if the engine doesn't provide enough vacuum to actuate the valve? My car's diverter was mounted so that the side connector was on the pressurized side -- in other words, the valve itself was mounted at 90 degrees to the direction the pressurized air is coming from, instead of being mounted to face the pressurized air. How is the valve supposed to work in an oh-shit situation, if the pressurized air can't force it to open? Is there something I'm not taking into account?