this is a very controversial issue. you will find many saying Vitz cannot be converted to cng while there ARE many happy owners too. i am not too technical but a senior friend here told me that ppl don't get emulators (or was it advancers?) as they deem them to be a sheer waste of money but in actual, THAT is the secret to safe keeping of blowing off sensors, pathetic performance and oh! a host of unwanted problems.