i have a jdm v7 drivetrain swap into my 03 bugeye. I sourced the entire drivetrain so plug and play to include axles/hubs and r180 rear diff. you need to match trans out ratio with rear diff ratio, your wrx r160 does not match. And r180 stronger.
You'll need a dccd controller, recommend dccd pro. I have an older neetronics. at the same time replace all axle and prop shaft seals, both front and rear.