PHASE ONE ECU UPGRADE RESULTS   The first graph shows the effectiveness of the Phase One ECU upgrade on a 1998 UK Impreza Turbo. The broken line shows the power and torque without the ECU upgrade, the solid line with the upgrade. The car gained over 40 lb/ft of torque through much of the mid-range, and around 30 bhp once the turbo had come into effect, and was mapped to use regular unleaded petrol (95 RON) at the request of the owner.   The car was fitted with an aftermarket exhaust front pipe and rear box plus air filter during both dyno runs.       The second graph shows the effectiveness of the Phase One ECU upgrade on a WRX STi IV. Again, the broken line shows the power and torque without the ECU upgrade, the solid line with the upgrade.   The car was fitted with an aftermarket exhaust front pipe and rear box plus air filter during both dyno runs.