I took a couple of days off from Racing Battle, but started in last night to begin the final push to complete the game.
Five drift point battles needed to clear against various wanderers.
One racing point battle against ??? (unknown).

There are three cars I almost always have on hand in a Genki racer: A Silvia S15(or a 180SX Type X), A Supra RZ, and an Evo of whatever generation is current for the game. I have other cars too, for fun or to complete wanderers, but these I have consistently.
I brought these three guns to bear to sort of stay 'traditional' in completing the game.

The Supra was used to defeat ??? in an SP battle several nights ago.
Used the Silvia for the five drift contests apart from the ones requiring a certain car.
Used the Lan-Evo to defeat ??? in the final contest, an RP battle in the rain. His GT car was no match for a rain-set rally machine.

Done and done, Racing Battle sorted! I will try to put together a wanderer guide since old online sources all appear to be gone. But it'll take me some time and cross-referencing to get the names right. Cheers!

I'd like to see pics of the game, and stuff.