Good looking part - Installed with Green Spring and no disks in under 10 minutes. Pulling it off of the delivery pipe is the hurdle. No blood, skin, or fingers lost in the process. Pinch the hose clamp, grab the OEM DV and pull/twist/wiggle/grunt, etc...
Don't really know how to tune this without it being on a dyno or the like. Really can't "tune" it unless I have a good gauge connected to it and another pair of eyes (VISUAL), or the top down and the bonnet removed (AUDIAL)... The valve seems to keep boost on strong, and diverts the boost well (maybe a tad sooner than the OEM Bosch unit). I don't really care for the noise, but if it's doing it's job right, I'll live with it.
Next up, the ETS Intercooler sitting in my den... Need to reserve some time out of parenthood to do it.
5/5 beacuse it looks so pretty. Honestly, I ought to give it 4/5 since the OEM DV was working OK - it's not THAT big of a change.

Rating: [5 of 5 Stars!]