Depends on the car. Think in the rivals thread were suggeestions for good tuners.
I usually start with nalaks (had a numer in his gt think it was 24) tunes if I don’t feel like making my own.
Sepi Sp4’s are often good, but the ones I tried were a lot better when driving manual.
Rocklxd is also often recommended.
Oh, and K1Z Bard is usually a good option.
Edit: nope it was Nalak28, me and remembering gamertags,… 