Ok, here is a a block 120 dyno of the stock ("before") turbo inlet pipe and the Neuspeed one. The following caveats apply:
1. I was very busy today and did not do these in a controlled way
2. They were done at different times of day (Stock at 1pm, NS at 6:30pm), so the intake temps for the NS pipe were about 4 degrees C lower at warm idle.
3. They were done on different roads (which shouldn't matter).
4. Warmup time and driving speed and time before each was about the same.
I don't really know what to make of this. If you "smooth" out the curves in your mind's eye, it looks like the NS TIP gains a little HP and TQ across the board, but part of this (maybe all of it) might be due to the difference in test temperatures. Also, the data is so jumpy that it's hard to really tell.
Butt dyno says the car pulls a little harder and it seems to get to 15 on the boost guage a little quicker, but hard to say for sure.
[Modified by dbrowne1, 8:59 PM 2-6-2002]