I have often though about doing B20 before I went Turbo
I got put off by cylinder wall cracking and for the effort involved a well built b18 will make nearly as much jam
I recall many years ago there was a Blue Lancer in Wellington that was on cover of NZPC that was a FWD Mivec Turbo and made serious power.
The 1.6 Mivec Cyborg motor was rate for 10kw more than the B16a so I'm expecting it must breath
Go the HX if MIVEC is anything like VTEC it will breath.
My Civic with a 1.6 B series has the Xonarotor 5757s I've got with a .82 rear is fully on song by 3500 and holds till 9k
182KW at the hubs on 7psi