Ok i didn't explain it vary well and i have look at it again. this is how i see it. The hat/butterflies is just that. only it don't go down to the blower it simply goes into the turbo intake piping,(back side of hat) threw the compressor of the turbos and then plumbed under the hat (the alu box under the blower hat). this alu box is sealed to the carbs and then enters the blower.
So the blow off valve could still be working properly, Right......