on a K03 or K03S all 20 psi + of boost (1.3 bar) is going to do is prematurely wear out a turbo!
Even 1.4 bar on an S3 K04 is the maximum effecient boost!
17 psi is at the very, very top of a K03 compressor map.
Here is a thread from 5 years ago where they map a K03 in regard to a 1.8T engine.
http://forums.generationdub.com/showthread.php?t=4207
If you are making 24+ psi on a K03, check your boost guage / connection / location & make sure its fully accurate
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