http://m.ebay.com.au/itm/400775051498?nav=SEARCH

Word of caution: they dont work on all obd2 equipped cars, it doesn't work on 2003 lancer and 2005 carolla. So might not work on 99 wrx.

using the Perth-WRX mobile app

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MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR

Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport