I did measure it with a stopwatch way back.....3 to 5000 was significantly better. This was with a big 997 diverter tee. 5K onwards was not an issue. Unfortunately I did not record before and after times. I also reduced the diameter of the air duct from the MAF housing to the TB......I would surmise that this had to do with getting closer to optimum intake charge velocity and acoustics
The snorkel also has what everyone calls a drip tray. I call it an air deflector and think it is designed to direct air into the snork and air box.
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