Yep.

"Steve Foley" wrote in message
news:vJH_d.8906$Ue6.6713@trndny04...


You need 2 STCs. One for the engine, and one to install the higher power
engine on the airframe.

When I did the same thing to my Cherokee, I got the engine STC from
Mattituck and the Airframe STC from AMR&D.

If you don't have an STC, you need to get a field approval.