Many people have been asking you, Rockstar Games for iconic jdm cars in GTA Online like the R34 GT-R, Toyota Supra, Mistubishi Evo 9, Dastun 240Z, etc.

The online community would be grateful to see this in the future of GTA: Online:

Annis Elegy RH7 (Nissan Skyline R34) (Best Car)
Annis Elegy RH6 (Nissan Skyline R33)
Annis Elegy RH5 (Nissan Skyline R32)
Annis Higashi (Nissan Silvia)
Vulcar Owari (Datsun 240Z)
Karin Minato (Toyota Supra)
Dinka Jester classic (Honda NSX)
Dinka Flash (Honda Civic ek9)
Bollokan Sumo (Mazda MX5 Miata)
Bollokan Jiyu (Mazda RX7)

And many other small things that will appeal to us car loving GTA players that can be found in the links created by other people. 

https://plus.google.com/109875356479627760004/posts/Ne8ef9g5f2g​

https://support.rockstargames.com/hc/communities/public/questions/202955803-GTR-R34-Ellegy-RH7​

https://support.rockstargames.com/hc/en-us/requests/3561065​

https://support.rockstargames.com/hc/communities/public/questions/203581336-idea-for-future-update-ROCKSTAR-PLEASE-READ-IM-BEGGING-YOU?locale=en-us​

https://support.rockstargames.com/hc/communities/public/questions/204015916-DLC-idea-?locale=en-us

Also there are countless Import/Tuner DLC ideas emailed to GTAOnline@rockstargames.com.