Air restrictors

Dear All,

I am now curious about the air restrictors of the GTR.
So here are my numerous questions:
First of all, I would to know if anyone knows the size of the air restrictors, if the size evolved through the years (restrictions making them smaller).
Then, on the Longtail, the size of the 5,990 cc variant air restrictors, and the ones on the ABS-fitted BMW works cars, to compare the gain (due to increased weight).
Finally, in order to understand how restrictive these are, does anyone know the section of the road going version air intake (at its smallest)?

Thanks in advance.

For 1997 GTR, I found the following information:
. 34.3 mm air restrictors for the normal version;
. 35.3 mm for the ABS-equipped cars.

Actually, when creating this post, the idea I had in mind was the following:
Air restrictors are obviously a way to reduce power by limiting the mass of air that the engine can suck in, by limiting the maximum RPM (when air reaches speed of sound).
With all things being equal, being able to compare the air restrictor surfaces of each configuration (road car, GTR 95, 96 and 97), we could estimate the power of a air restrictor-less McLaren F1 GTR.

Someone in the know reckons 700bhp+ ;)