V21 is the latest for the WRX/UK
The only variant I have newer than that is upto V23 which was when I was setting up the last of the MY95/96 STi V2 RA with a raised rev limit (the RA runs a higher Rev limit as standard)
V21 uses the Z4 baseline with more aggressive low throttle/rpm boost control, a 16.11psi peak/held target boost and fuel/ignition timing adjusted (a touch leaner than standard Z4).
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