I have a 2003 gs300 and have been contemplating trying something I haven’t seen before. I want to remove the cd changer and install a “mini pc” in its place. Then fab up a small mount on the steering column and install a 7”-10.1” touch screen. Having the computer hard wired to the OBD2 plug should give a pretty reactive response time common to throttle/boost/vacuum. From there the sky is the limit.