5663 --- the most problem ecu .. always burn the power supply and afr chip.. i got many faulty 5663 ecu at my wshop.... to be honest if u wanna find the rite ecu for ur gsr is 7377 or 3308 or 5070.... not baking this thread.. just wanna let u guys know about the ecu.... another thing is 7377 , 3308 , 5070 got e prom that can reflash the map. for example can add launch control system , antilag system , i got that flashing mmc ecu that import direct from australia. 5663 heheheheh in malay org cakap( mana ada org pakai itu ecu)