Hey Izzy,
I just got my '15 Hybrid, and I have the THX system which is decent no doubt, but I'm thinking of adding a sub, at least. How do those enclosures hold up? any flexing or anything? I have far less room to work with given that the battery system etc. is in the trunk of the hybrid, so am thinking something like those formed enclosures may be the way to go.
I think I have a battery and amp in the trunk however, so wiring may be somewhat simple...
Oh, and where are you in TX? Austin here...