I have a C900 T16 (Aero?)

She only boosts to between 60% and 75% of orange.  I have been told that
this is due to a faulty air mass meter, and that the engine is not getting
enough fuel.  (Bosch system) This was from a local respected saab
specialist.

I am not convinced.  I am pretty sure I dont have any air leaks, and a
replacement second hand APC hasn't solved the problem, although more boost
is available in fifth at motorway speeds.

Occasionally on startup theres a kind of "saxophone note" for about a second
from somewhere forward of the drivers seat, but not always and I've never
tracked it down.

I would really appreciate ideas, as although the car still goes like the
clappers, it is not as quick as it should be, particullarly from 30 to
60mph.

Cheers

Al