This season is not worth your time. Spoiler-free review: I might be exaggerating, but although the season is fun overall, there's only a handfull of episodes with some actual cool racing scenes, out of 51. This season takes place in a time mid/post WGP, where all the kids, besides de protagonists, are running with cars copied from the "pros". You can actually tell which specific cars they are copying and even their names are adaptations of their idols. (For example "Victory Champ" is a copy of "Victory Magnum".) The last 2 episodes feature some nice moments, but still nothing compared to that S1 and S2 brought. Did I mentionthe protagonists names? Gouki and Retsuya? Gou? Retsu? Really? And yeah, Gouki also has a straight-focused blue car, just like Gou's Magnum. Although Retsuya starts with a car like Tridagger, he will also end up with a car like Sonic. Zero originality.
Overall, the whole season seems like a 51-episode filler, with some cool moments here and there.