I noticed you have a gt4, how do you like it? also, what is the RC?
I've owned it for over 11 years now so I definitely like it haha. They aren't the fastest and they're a tad heavy but they're great cars overall. I haven't owned much to compare it to but a few friends with Subarus have said they prefer how the GTFours feel to drive.
The RC was a top-spec they made for homologation purposes. Toyota made 5000 homologation versions worldwide, 1800 of them were RC's sold in Japan. The rest were the CS (Europe) and the GrpA (Australia). Compared to the GRC it's sort of like a Morizo in terms of where it sits in the model range. There were a lot of changes to them from the standard GTFour, some large, some small. It has a different front bumper and crash bar, rear crash bar, hood, intercooler (WTA vs ATA), air flow meter, ECU tuning, transmission gearing, turbo, rear torsen LSD, etc etc. Which in turn affected lots of other stuff so things like the washer tank, trans mount, starter, wiring harness, air filter box, throttle body coupler, etc are all different too.
I considered going to a 6th gen GTFour, but functionally they're pretty similar except a 6th gen is annoying to get parts for here because it doesn't have a US equivalent like the 5th gen. Lots of Americans who didn't pay attention to what the Canadians were doing are now experiencing the fun of trying to source brake pads only found overseas. Or front SuperStrut parts lol.