RS500 Turbine housings can be changed due to a friend who can swap them out for me, it currently has a 1.06 on it.
CLINT32 Sorry, compressor wheel can not be changed.
Doughboy Yes, when originally purchase it was confusing as well. Lots of Info and some of it didnt add up. Like the compressor rating and turbo rating. I chose to trust garrett as well as other people running this turbo and their Hp output.
This is the turbo spec sheet
http://www.gcg.com.au/technical/garrett%20...ng%20turbos.jpg
Part number 714568-0001
Garrett rate this at 700 Hp and anywhere from 60 to 65lbs/min
If you go off lbs/min yes it doesnt look like it will flow enough for 700 hp but if you take into account compressor in/out it certainly does.
Interesting note is that they rate the 0.6, 0.8 and 1.06 all at 60 lbs compressor flow...
Maybe there is a difference between compressor flow and turbo flow?
To give you guys an Idea, I have a mate running one of these on his car. It has a RB30 botton end and RB25DET head- and his car is on song at 2500 Rpm and still yet to run in.