Yeah, same box (IS200, S15 200sx, S2000). Its called the J160, Junior to the V160. I bought one of these thinking it was a V160 as i had never heard of another 6 speed (tremec in toyota cars), how wrong i was. These boxes are terrible. They are small (physically) which gives its strength away right there! They have an intergrated front bellhousing (non-removable bell [have to remove the front section of the g/b]) which make mating purposes harder if you were going the CRS/Dellow options etc etc. As much as it pains me to say it, I spent $1000 buying mine, then ended up swapping it for a freshly re-conditioned later model (aka steel sandwhich plate) W58. Which i sold for only $600. I have now gone down the R154 route, was lucky to bring one back from the USA ($700 inc shipping to Aust.) when i went over on holidays 2 years back. I feel these boxes are up to a lot more power (will probably still break it to) compared to J160/W5x. R154 is also a lot more affordable than a V160 or any other 6 speed on the Aust. market.
Just my opinion...
Judd.