VF36/37s are too small for a 2.5 IMO. If it was purely for motkhana / very tight stuff it would work, but they do tend to run our of breath quite early.

I have gone for the GT pumps td05 twinscroll which is just about the right size. It made 313hp on 18PSi but it still comes on a little bit late for my likings and for the hype about twin scolls.

I'm keen to see results from the prospeed versions, but the test pilots so far all seem to be in the middle of a long term build. Otherwise, if you can source a VF42 at non crack pipe prices do it!

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Twin scroll Pig Bi-Squeeling