RX7 4 pots and G60 discs fit easily enough once have adapters.
Porsche BoxterS calipers work well too but discs are abit tricker than just boring out G60 discs and bolting them on.
There's no kits that'll bolt on other than off the shelf kits. E36 brakes will fit no problem but need to change the whole struts and rear arms and 5 stud then of course while geometry isn't prefect without abit of messing around with custom wishbones and bushes etc
Past 6500rpm, nobody can hear you scream.