fellas... looking into a strange hissing i have, now when i went from bypass back to oem, i had to fabricate the pipework a bit due to losing the oem stuff. the pipe that comes from the dv nipple top.... what size is this, as the metal hard pipe it adjoins to under the dv is a larger diameter... and the pipe that comes from the vac reservoir to the other metal hard pipe to the left of the dv one.. diameter on this aswell? trying to eliminate weak points in the system for leaks help appreciated on this one, i can hear a hissing from around that area, was there before the fmic install so unrelated. symptoms i have... in 2nd mainly hesitation on part throttle, high revs in 5th and 6th pull back slightly then go and pull back alittle more. vagcom suggests no boost leaks, but is running lean. starting to annoy me now, just want it running right also seems to be using more fuel than normal|?????