Yes, twin rotor.
Triple rotor or quad rotor would mean less revs, same as going longer stroke on a normal engine.
But possibly more power, and deffo more torque (well, more for the same boost and general spec).
But when can get 1000bhp+ and 13000rpm+ from the 13B and all the fastest ones being 13B engined, there no mega hurry to swap!
Greg- No, ive not dared, but yeah, if i go dart i will use the big daddy turbo

The one on ross's RX7 is almost the same size actually, only a tiny bit smaller