I have a 02 SI with a A2 head and a CRV block and my friend wants to do the same, but he also wants 2 boost his so should he turbo his A3 engine and upgrade his turbo when he gets his swap or swap then boost. I told him 2 swap then turbo because I didn't think the turbos wouldn't be that close in compatibility. Thankz I'll relay all info here to him.

 

swap it then turbo. more expensive the other way around.