mugen still produces one of the finest, literal "bolt on" ecu u can find for the DC5. however, being a bolt on, the ecu has its limitations. it may be great for simple bolt on mods, but slap on a set of wild cams or do some major works to ur engine, then u'll still want a fully programmeable ecu to keep up with ur mods.
there are plenty of other alternatives if you look around. even in sg, u'll find enough sources to help you out if u keep ur eyes peeled. PM me with your contact if u need to know anything else. i'm based in sg too. :wink: