Having Maestro would make turbo upgrades, CEL defeat from DP, etc much easier to deal with. The APR upgrade from IS20 to IS38 on APR is like $300 or something anyway?Custom tuning on the 1.8 is something I've actually become quite interested in recently. Been planning a turbo upgrade over my is20, and I'm currently torn between going with a hybrid is20 to keep my low end spool or just grabbing an L380 from littco. While I could probably get away with a Jb4 on the former, I'd much rather have it done "right" if that makes any sense.
Besides living in California the ability to modify my tune at home is kinda nice. When I eventually have to start smogging it'll be nice not having to drive all the way up to my APR dealer lol.
Eurodyne told me they don't have a base map for a IS38, but you could use the IS20 map as a base to tune for the IS38. I assume you'd do the same with any factory location turbo. Of course you have the option of getting a protune too. The base map they have for the 1.8 IS20 is a DP tune. I guess one could just use the slider adjustability to just pull back target boost a PSI or two for no DP.