i tried cap ayam brand b4... no gurantee on their quality, branded one although pricey, but can feel the difference, make sure you found the right person/shop which honour their product will do...happy modding!!!
I bet y'all know the MUT, a bulky hand device that so-called tuners connected via a connector to ECU and was used to 'tune' engines (with stock standard ECUs, especially local cars).