Again, the Japanese aftermarket is so, so, so much more varied than just Liberty Walk, Rocket Bunny, and RWB. Those are the big 3 companies that everyone knows. RWB and Rocket Bunny (formerly TRA Kyoto) have been doing things for a while, with Nakai active since at least the early 90's, but their current stuff is, like Liberty Walk, extremely derivative.
I'm talking about companies like AB Flug, Veilside, Re Amemiya, URAS, Top Secret, Backyard Special, FEEL's, Esprit, TBO, vintage Mugen, etc. Companies that were (and in some cases still are) extremely active in the golden era of Japanese tuning and helped to make legends out of a lot of these cars.
I have no problem with including new companies, but more variety is desperately needed for a game that is supposed to be all about celebrating Japanese car culture.