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You ever noticed when you replaced you stock exhaust with a new high flow 3", you lost a bit of power down low, but this was greatly out weighed by the gain once the rev rose above 3000rpm???
This is due to exactly what you said. The extra scavaging from the exhaust helps to pull the gasses out of the cylender, however once the turbo starts moving, the spent gasses have enough charge to force itself out of the cylender faster than any negative pressure in the exhaust could try to pull it out, thus it is better to have a low speed/high volume exhaust than use gas speed to create the volume (smaller piping), as the negitive pressure will actually slow the high(er) pressure gass trying to get out.
NB: perfect examples of this is in NA cars, where once your get over about 2.5", no gains or even losses may result from increase exhaust size.
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