The oil drain pic is dark and not visible

Just buy it clean it, clock it and use it

If it's journal bearing T25 T28 / T2560 then it's still great

Mine with a 3" downpipe was fully spooled at 1 bar at 3200rpm

Cheers man, the owner wants 378$ (280€), do you think it's worth? I'll try to pay him 340$, understanding that I'll need to buy the adapters. Here in Spain, unfortunately the stuff is more expensive that in the states.

Yes that's ok price

Just make the adaptors from stainless exhaust components and either weld or silver solder them up

Don't you think that bolting the adapters to the compressor will be enough? (Turbo Compressor Inlet Outlet Adapter Flange Nissan SR20DET s14 S15 T28R GT25R | eBay)

No

If they don't have o ring seals you will need to use RTV sealant on a clean and flat compressor face then bolt

From what I've seen the ones I'm planing to buy from Kinugawa (the link above) have them, so not additional sealing will be needed.

Thank you very much, you've been really useful!

Just for info (I'm not IDing this turbo!), I believe the T28 Journal Bearing predecessor to the GT2560R is the TB2815.

As fitted to the SR20DET in the Silvia/200SX (S14). Same compressor/turbine dimensions as the GT2560R.

Garrett Model TB2815 Repair List - 471104-0001 reference - Turbos - TurboMaster

Wow, the 3" exhaust does wonders then! I may have to add to my shopping list as mine def comes on far later, I top out just under 1bar (~13psi).

I just used generic ebay alloy inlet/outlet adaptors similar to above, they came with basic gaskets that seal fine. Personally I'd avoid the Kinaguwa Turbo outlet shown as it has that superfluous wastegate port. As per various threads on here, it appears to be a better option to take the Wastegate feed from just before the Throttle Body, NOT direct off the the adaptor as show.

There's more to it than just diameter. Downpipe design, manifold volume and design, tune & also air ducting design etc

Also make sure the journal bearings and turbine shaft aren't gummed up with burnt on oil

Ditch any CAT!

3200rpm to beat ;)

Haha, fair play! I'm on FM hardware, with a generic NA 2.25" Cat back system. I suspect that may be the largest restriction in the system at the moment, have fresh bearings in the turbo and no cat.

It's great to know I have plenty of room for improvement!

It's shocking how much post turbine pressure there is even with a 3" system. I had a pin hole in my mid pipe and got under the car with the engine idling and I could feel the gas escaping with some fair pressure

it's not shocking at all. there's at least the same amount of exhaust pressure as boost pressure, plus all the extra pressure from the combustion. I'm sure the exhaust pressure before the turbo is double the boost pressure, then you're trying to force it all out of a 3" pipe while it's cooling, slowing, and expanding.