I’m sure if I searched I’d find the answer, but I’m lazy, and this thread = more site activity 
Does the 2-11 intercooler shroud fit directly onto the standard S2 Exige intercooler?
given that the intercooler shares the same part number as the exige, I’d say so
Straight on perfect fit. It fits that well I haven’t had to secure it any way. Now! getting the 4 in ducting down to the side pods was a pitta for me, I bought high quality double ply ducting that doesn’t want to change shape add that to the fire suppression pipes in the way. 
I have acquired a used 2-11 intercooler complete with shroud (only wanted the shroud, but eBay was good to me;)), but the intercooler seems thicker, so I’m surprised it carries the same part number. I’ll have to get the tape measure out to satisfy my curiosity.
Not secured at all? The shroud I have is currently riveted to the intercooler so would have thought it needs some method of restraint? 
I was thinking of just leaving 3" ducts to the pods, and then use some sort of converter at the 4" shroud end. Saves having to change the well made side pod duct ends 
ah it does share the part code with the exige, but the cup 255/260 which has a different duct to the cooking exige
That makes more sense
Yeah I used a bit of double sided tape to hold mine onto my standard S2 inter-warmer
That tape will do it if you have any left, primarily for use on metal … Degrease first though.