Buy a Mazda MX-5 Gen1, upgrade it with sports tyres, increased tyre width, racing suspension, anti roll bars, brakes, diff and a sport transmission, a rollcage and spend the remaining points on lightening it, just don't increase its power.
That thing will beat basically anything around Fujimi Kaido.
Otherwise, there's a tune for the Toyota Truen on my storefron that should do reasonably well, too.
Good luck!