Autopilot up grade

[Alainb]

Hello

I am in a buying process for a P337.
The plane has a awesome avionic but has only a STEC 30. I would like to up grade it ... What would be the best solution for a better AP with the minimum of work.
Thanks for you advises

Alain

[Learjetter]

If STEC 30 is installed, look into STEC 55x upgrade. No modern digital autopilot is (yet) STC’d for Skymasters.