We've run both the small "street" and the "race" by-pass valves on alot of different set ups.
The only issue that I ran across with the small valve was that even on a D1sc making 16 #'s it was not venting enough boost pressure. Or venting quick enough...when it would open the blower would shutter similar to the sound a turbo makes when bounced of the gate...this caused some stumbling problems in on-off-on the gas situations (pedaling) Especially on injected cars with a mass air meter.
This is were the red or bigger race valve helped...it dumps a lot of friggen boost pressure and fast and more responsive...the only thing is, from the front of car or next to it while driving it sounds like a jet engine when not in boost...some people like it, some don't
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