That is not a modern Corolla iM. The iM had about 130hp. The GR has 300. The iM had comfortable, "sensible Corolla" suspension. The GR has race suspension.
This is not a "basically stock" corolla. It's actually a really cool car with a fun story behind its design. Toyota's then-CEO Akio Toyoda is a big car nerd and an accomplished race car driver. The GR Corolla was his dream car. He was directly involved in the design and development of the car, and personally took the prototypes to the track for test drives to provide feedback to the engineering team.
It's ok that this is not your thing, but please do not be condescending towards other people's hobbies.
That's a whole lot of words to say "Corrola with a bigger turbo and a hard durometer poly bushing kit".
The normal corolla does not have a turbo at all. Besides the turbo, the GR Corolla has a completely different engine, different transmission, all wheel drive, limited slip transaxle and differential, and completely different suspension.
They should not have called it a Corolla at all. It's nothing like a Corolla.
> Corrola
Corolla.
And I suspect Toyota put a little more effort than that into the GR.