I read this thread about changed stats for an Intellect Devourer sitting in a body. The Intellect Devourer keeps his spell like abilities with CL 8, but what about his spell resistance and damage resistance?
For example he occupies the body of a Nuglub Gremlin (scroll down a bit to see the stats).
Does he now have DR 10/adamantine and magic (from his own statblock) or just DR 5/cold iron (from the Gremlin)? Or even both? What is his Spell Resistance now? SR 23 from Intellect Devourer or just SR 13 from the Gremlin?