Just started watching the first season of this anime and am having a lot of fun recognizing the cars! Made in mid-early 2000's, the star is Sprinter Trueno AE86 GT-APEX, and challengers include the rotary brothers with their RX-7's, an R 32 GT-R, Silvia's and more. Looked at the wikipedia page to see if it had anything to say about what other cars will be featured in future episodes/seasons, and it looks good! MX-5s, Civics, Spoon Civic and Integra!, Evo's, even a Cappucino!!! R 33 and R 34, too. Sileighty! Altezza RS200... um, I forget what all eventually. Many of the non-racing street cars in the background are clearly recognizable, too, pretty sure I just ID'd a Nissan Micra Super Turbo...
Granted, character animation is pretty shabby, more like what you'd expect from anime in the 80's, and plot and character development is about what you'd expect (think Japanese high schoolers, not Fast and Furious.) Cars and races are CG but not quite the quality of GT4 really, but still pretty nice. Lots of meaty technical comments throughout which I understand only because I've played GTs. Lots of drifting through technical downhill mountain courses featured so far, and there's supposed to be uphill in the future but not for the AE86 I'd guess.
Anyway just wondered if anybody else had encountered this piece of automotive entertainment, and thought I'd recommend it to those who aren't opposed to anime.