scoobyfuzzy Posted October 16, 2006 Posted October 16, 2006 just wondering wot the difference is between a z5 ecu and a z4 ecu, looking to upgrade the ecu on ma scoob, which one would i be better to get, z5 or z4. fuzzy
euan_r Posted October 16, 2006 Posted October 16, 2006 z4= import wrx z5=import wrx ra. they say z4 is better for uk fuel, as z5 is a tiny bit better but then we dont get 100ron.
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