It's always worth shopping about at the specialists as there are more ways than one of doing this job. I wouldn't like to attempt replacing the AOS without at least dropping the engine part way down, that carries it's own set of issues & tasks.
Just to give the OP even more choices... You can get an aftermerket AOS for quite a bit less than the OEM one from here
http://www.type911shop.co.uk/shop/a...jZrYzVmrJl33Tyun&shop_param=cid=401&aid=8262&
I have one of these ready to be fitted and the quality seems fine though I can't say if it will be any more or less reliable than Porsches offering
:?:
Just to give the OP even more choices... You can get an aftermerket AOS for quite a bit less than the OEM one from here
http://www.type911shop.co.uk/shop/a...jZrYzVmrJl33Tyun&shop_param=cid=401&aid=8262&
I have one of these ready to be fitted and the quality seems fine though I can't say if it will be any more or less reliable than Porsches offering
:?: