Yeah a fucking site better than 21, 97/8 STI's run close to that stock so a WRX should be able to cope with it for a while, but like I said....14psi is better.

Sorry mate, probably a job for a tuner unless you put some sort of in line restrictor type thingy in there.

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Beaten up old 98 Gen 2 Liberty, 13.0, stock V3 STI running gear.
07 Transit motor home
69 VF & 70 VG Valiants needing full restoration
Yamaha Zooma 50cc rocket hopefully going with the Transit.