[Shaggy]

If you really want to spend some time and fix some of the drivability issues iu have seen you can drill a hole on the center of every inside bend not much just an 1/8" to relieve the vacumn the forms at the inside of every bend. Now if you are worried about unfiltered air then you can run vacumn hose from the hole to a hole base of the filter or the cai just after teh filter if it is a hole after the mass air meter though you will need to run to just in front of the trottle body. (I have actually used the pcv vacaumn port in the TB on the fox's). Now all that being said if the actual pipe is substancianly smaller then the mass air then no amount of "custom" work shy of cutting and put a RE on it far enough away from the meter for the air to stabilize (if it were me i would cut to just before the air would the last bend so that you had one bend that was oversized and then a straight piece to actually feed the mass air after) then the sampoling tube won't get a good sample.