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Message: <blockquote data-quote="ehoe" data-source="post: 74018" data-attributes="member: 141">Just curious, if the ECU 173 can be used on both the M20B20 and M20B25 and is supposedly optimised for max HP on both engines, does that mean its an intelligent ECU that knows which engine its plugged into?. Common sense would think that a 2.0 & 2.5 engine will use different fuel/air mappings, larger injectors, higher pressure fuel pump, etc. So that would mean the ECU 173 is intelligent enough to know which settings to use in the 2.0 or 2.5 engine. hmm....so canggih one meh the ECU?. How abt using the ECU 172 on a 2.5? If the ECU follows the 2.0 fuel/air mappings, etc wouldn't the engine be running lean or something?. Very curious.</blockquote>