The brakes are already incredible, not sure if this is necessary
This maybe valid for those that don't track or push the car, but 2 piece rotors can be a great upgrade depending on your use case.
Similar sized 2 piece rotors by themselves won't increase your overall total braking power, but it will reduce rotational weight, reduce heat soak for track work, and improve service intervals (Giro's metalurgy is better than most OE offerings, but I can't speak to the Emira since I don't have enough data yet).
While I don't have the OE weights for the Emira discs, there are applications (Like the Jag F-Type) where OEM rotors weigh 39lbs a piece, while the girodisc 2 piece is 29 lbs. 10 lbs of rotational weight is substantial. I'm not hyperfocused on losing weight on this platform for my use case or analyzing the $/weight reduction point, but will happily welcome it.
Personally, I would be changing to Giro 2pc rotors to experiment if it'll reduced heat soak (I track the car) and provide longer track service intervals. Giro disc will offer replacement rings, they've done it for every application they offer.
I solved alot of thermal heat soak issues/frequent rotor changes when I switched to Giro 2 pieces on other platforms for track work, but I acknowledge that doesn't guarantee the same on our platform.
FYI, GRP is working with Girodisc as well for something similar.