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You can get a Z4 ECU and plug it in directly (from a MY96 WRX)
Or you could get a ScoobyECU chip when there is stock. This will cost approx £100 and get you a little more than 260 and allow you to run on super/optimax without booster.
There is a very slight benefit in chipping the new (Z4) ECU, as they are little more stable with the ScoobyECU. Probably not worth the extra £150 though!!