parrisw
Tree Freak
I think the guy that did it has done about a 1000 of them. He said it's his specialty. He said he can get a 390 close and a 395 does ok in real big wood that he's done. I don't know what he does but it really runs. He doesn't use popups either. I do know that from looking inside.
Stihl's generally have higher compression then husky's, so a popup isn't always necessary.