ah great news guys, cheers for your input, i got the turbo real cheap, its only done a 1000km so its still fresh..the pictures are bad i know but that actual rear wheel is as large as you can fit in that housing by the looks of how much its machined out...
my mate removed it off his rb20 due to the rings on number one going, he's currently forgie rebuilding it and wackin on a gt3540 off xr6t, not sure the rear they run i think .82 or something....but yea thats a different sorry.
The turbo on the 20 was a little laggy (rb20 nature anyway) came on strong at about 3700.
im about a week or so away from eventually fitting the gear so will have results soon for you guys.
anyone know if this core needs different fittings for oil, coolant etc..or will the standard rb25 lines suit? or is it just a matter of buying lines to suit gt2871r cores?
cheers for the info guys, really helpful, keep ya posted with results