HKS Log Manifold also know as the short runner:
This smaller tighter andmore compact manifold is good for the HKS T04E
series turbo, generally a smaller turbo, and this manifold is good to make 450
rwhp on the turbos it supports. It however has cracking problems.
HKS Long runner:
This larger and better designed manifold is built for spooling big turbos
almost like a tuned header for big turbos. This will hold bigger turbos like
a T-66, T78, etc. It's a MUCh better manifold, and not prone to the cracking
problems. I just sold one for $450 shipped, and that was as complete steal.
I would say these should go for $650+ I was in need of cash!
this is my take on the products, having owned both.