I just finished up doing dyno tests with ny_fam (scientific rabbit) on Mk3 (ABA) and Mk4(AEG) 2.0L intakes. The results were interesting even if mildy depressing for me personally. (my motor is shy about 10 to 15hp from what I figured )
Here's a link to the thread that summarizes everything: http://forums.vwvortex.com/zerothread?id=4687491