Well, sort of a car.
I've just finished changing every single rubber bushing on the 4xFord for polyurethane bushings supplied by Energy Suspension Components in the US. I've also changed the anti-roll bars for lighter components from the same source, and I've replaced the short link from the roll bar to the lower wishbone with a more rigid component from ESC.
It's transformed the feel. Much tighter and more willing to turn in on corners. Still not a sports car, obviously. It's also less susceptible to tramlining in lane one on the motorway. The only oddity is that it now feels as if it's oversteering on bends, which I'm guessing means that it's understeering less than it used to.