The 310hp SR-22 17,500 foot ceiling is a certified ceiling not a
service ceiling. It is actually 500 feet less than the 200hp SR-20
ceiling, so I doubt that the problems with the plane were caused by
being close to it climb limit. I don't know whether that plane had
oxygen, but it is a factory option.

huh I didn't know they had an option on oxygen - that's a LONG way down -
interesting, well like I said should be an interesting NTSB report thanks
for the info