964, 993 and GT3 intake plenum diameters?

[Nux]

Gents

I need the Pelican Brain Trust once again

We're experimenting with plenum options for the JSR ITB's.

Currently looking for options for the 3-stud variant (964/993). However, we need the ID on the plenums and I can't find it anywhere (did a search).

We measured a plastic 964 ID to be 36mm which is too small for our application.

Anyone know the ID on the 993 versions and the GT3?

For reference the openings (or ID on the flanges) on the JSR's are 48mm for the 3.6L and 50mm for the 4.0L. The 3.6 taper down to 42mm at the port and the 4.0L to 45mm.

[wallra]

GT3 manifold I.D. 48mm