I have a great tuner for about €240. Corolla’s value is around €1000 as well. I mean mine has work on so it has a better value but you can buy it for about €1500/2500 in good conditions.I would go with a det3 from ecumaster if you go for a piggyback. they are 160 euros new. Making a plug and play loom may cost about 50 euros. Depending on local tuners the emanage or the det3 is the way to go. Mapping will cost a fair amount of cash.
The 4efe is really expensive in your country. Here you can buy a full car with 4efe for 700 euros