I've had my 911 since 2009, and Never Ever noticed a post about this !
I didn't know to check this, I never got the memo.
I have checked and checked , and looked for air leaks, and smoke tested, and replaced the airbox hoses and clamps,
and replaced the intake runner gaskets, and, and , and, until finally, just like stevej37 said, I gave up and thought to just live with it that way .
( I even secretly messed with the mixture, don't tell anyone )
I was so happy to see this post and finally discover the answer to my dilemma !
I got one of these from our host
and I've always wondered why there was a handy split with clamps on that hose?
So I removed all the clamps the other day, and removed the shorty piece, and looked into both hoses with a flashlight, oops, no, no restrictor!
It seems that a PO or retarded shop removed it way long ago, before I had it.
I took it apart again today, and jammed the restrictor into the shorty hose, see the bulge at the red arrow,
and ha ha, now I can check my oil correctly, while it's running, and Not stall, die !
I think this should be a sticky, required reading, how can we not know this ?
Now if someone searches, here you go, here's a big answer, thanks Ivan !
Best $25.00 upgrade ever.