One more thing about the Stec company.
FYI,
You cannot install used equipment. They will not issue you an STC. According to the current managment practice, when you purchase their equipment.
It has to come from an authorized dealer and installed by an authorized dealer and is serial number specfic for your aircraft no transfers are allowed. Makr sure you call Stec first if any of these conditions apply.
Good Luck,
Jeff