In my S3 I originally had the ITG intake. I got the opportunity to try the Revo intake when it came out and the difference in air flow was surprising! My S3 drew in 9g/s more air than the ITG which equated to roughly 11.5bhp
Once I installed the intake, I then installed Revo's throttle pipe and eventually their FMIC - the cars performance was fantastic :) well recommended!