please read
 

THE ULTIMIT TURBO IS THE T51R KAI!! But it takes awile to spool if it was BB it would be secound to none. lets show the guys how active rx7 guys are and bombard the post in product requests and get them to make th et51R KAI BB. hks website

Well lets try and think about this logically. You do know that HK$ does not "make" turbos, right? The HK$ units are essentially Garrett with a HK$ stamp on it. Now, Garrett has a GT series of dual ball bearing turbos, two of them being about the same size and bigger than the T51 Kai, with equal or greater construction, and without the HK$$$$$$$$$ stamp on it. So, forget about HK$ and go buy a Garrett GT3540 or GT3542 (rated at 700 and 750 hp, respectively) and save yourself some $$$$$.

Word G...

they already have
T51RBB was released this year

there is no hks t51r kai BB I have talked to hks many times on this. I would go with another turbo but I am trying to keep it all hks.

I got the info out of a magazine, but i guess HKS would know best

from High Performance Imports
"T51RBB
The ball-bearing version of this very fat turbo was released this year, making it about the biggest proper ball-bearing turbo available."

You can make the other turbo HK$ w/ a magic marker [HKS] :D
Not only did you save money but got to design a custom Label for your fresh turbo.... god this class is boring...