Hi
I'm pretty happy with the SM4 so far but as its an older ECU so it doesn't have plugin flex fuel even though I will be fitting the latest chip and software to it. It is a plug n play ECU so it uses all the stock harness and sensors
My son is using this ECU
http://www.adaptronic.com.au/product/e1280s/ in his new drift car, its pretty amazing what it can do for the price.
My son is also using this dash as well
http://www.adaptronic.com.au/product/rt-dash-2-display/
Steve