From the HKS Australia website:

"An HKS and Garrett Turbochargers exclusive design, the HKS GT turbos are
designed to offer a balance between power and response that is often not
inherent with conventional turbos. By utilizing a ball-bearing center
cartridge, versus a conventional bronze bushing type bearing, weight and
friction on the center shaft is reduced allowing for increased response. A
unique compressor wheel design prevents efficiency drop during high boost
conditions and the new turbine wheel design of 9 square shape fins, versus
10 triangle shaped fins, maximizes exhaust flow to produce low-end torque as
well as high-end torque. The HKS designed exhaust housings incorporate a
spherical section scroll that quickens exhaust flow for better response and
utilizes a larger tapered opening that prevents exhaust pressure build up."

Specs as follows:

GT2540
T25 base flange

COMPRESSOR
Housing A/R Ratio: 0.60
Trim: 46
Inducer: 51.7mm
Major: 76.2mm

TURBINE
Housing A/R Ratio: 0.64
Trim: 76
Major: 53.8mm
Exducer: 47.0mm

Rated at a conservative 350hp

I ordered this turbo from Japan, but got impatient whilst waiting for it to
be delivered, and bought a Garrett locally to get my car on the road so this
is now excess. Garrett have inspected in Australia, and it is in excellent
working order.

Just looking to get back what I paid at $1400 firm INCLUDING postage.

i have photo's if someone can host for me...