Custom air feed project

Hi guys,

I’ve purchased a 1m length of 2-ply/80mm neoprene ducting to run a cold air feed to my Mountune intake.

Aiming to do something similar to what the Eventuri system has on offer utilizing the cavity in the under tray rather than the Velossa Tech application. Was wondering if someone has the dimensions of that under tray opening before I either buy or have a funnel fabricated (something like the pic below).

If someone has their car up on a hoist shortly or already has the dimensions of the opening, I’d greatly appreciate those being passed on.

Cheers!