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The small amount of leakage that was seen on some of the older sets was insignificant and not enough to measurably affect boost pressures or air fuel ratios. Using our pressure testing method, stock throttle bodies also leak down the pressure slowly. It comes down to what is a reasonable allowance. A small leak that is detected by blowing air bubbles in soapy water is not a factor. We aren't talking about a tire here. In actual operation there is a continuous feed into the intake tract of an enormous volume of air. The magnitude of the leaks we've seen are so small that we are talking about drawing a bucket of water from a large river. Even though our position is that they hold 40 psi with-out "significant" leakage, we do continue to take measures to get them as close to air tight as possible. Wheter of not it makes any difference in performance, of course everyone would prefer no leakage at all, and we are getting close with our last production run. I elaborated more on this over a year ago in the post below, which was in reply to the post that this thread originally started with.
La-Z-Link
Russell Floyd Z1 Motorsports
www.300zx.com
1990+ Nissan Z specialists Used Parts, New parts, Service/Repair and Performance
Z1 Motorsports Exclusive Parts Line 2877 Carrollton Villa Rica Hwy
Carrollton, Ga 30116 770-838-7777
770-832-9253 (fax) 
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