Engine tuning

[tmontague]

Even then piggybacks have been reported to essentially lose their tune as the stock ecu sometimes "relearns" itself. This has been well documented on corolla forums. The first gen Yaris' (echo's) don't have an afr sensor and piggybacks work fine on those which makes going turbo much easier from what I have read and discussed with people

If your country allows standalone ecu's and it keeps it road legal then go with a standalone ecu that your local and trusted tuner if familiar with. This will make it much easier to tune the engine the way you want