What Seagull said, stock V3 STI ECU with those mods will see a high 12 and great fuel economy, on a country run not taking it easy I got 732kl from mine before re filling with a bit less than 3L left in the tank, seriously good ECU and no dyno costs every time you do a minor mod.

Also the stock BOV sounds good through the standard air box with a cheap home made in guard CAI.

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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.