It was released a few years ago, but was removed for an unknown reason. It can now be found on a few Russian mod sites.
also i'd like to mention that this beaut: wasnt made by me- it was made by @LJ Designs He's quite the G and yeah, it will be released separate to WBIMP, but i am working on it too. felt like i needed to clarify that!
Still cool though. Here, my another Hirochi Matsuri R5XX wagon. More powerful, more nimble, more expensive and rarer than already rare RS Turbo.