INTENSE or ZZP may be better suited to ask that question. In basic terms, you don't want that 'swirling milling around' effect in your intake. You want to develop the velocity of the charge as soon as possible.
I think I seriously short-changed myself in July at the track with my old 3" ADTR. My Gen3 throttle plate is 3.25", and I was flowing (or trying to) like a madman with a 2" pulley. It didn't occur to me until later that I was choking it off. In your case, the L36 throttle plate is only 2.5" in diameter. That'* your most restricted point. So you want an intake a little larger than that because of the length.
My Gen3 throttle plate is actually 2.8" in diameter, but I'm pulling air through there like crazy. The odd thing I discovered back in June is that the 94/95 L67 throttle plate is actually slightly larger than the S2 L67 throttle plate. The small end is the L27 and 92/93 L67 with a throttle plate of 2.27"
Here'* some more info on the various dimensions:
The bottom line on a FWI or CAI is that it'* not necessarily 'bigger is better'. You want at least enough flow to satisfy the engine'* demand for air, you want it clean and cool, but you also want velocity. Particularly in an L27 or L36.