1. It's not an IHI
2. It's some Chiawan POS that you'll never get parts for.
3. It's not a T70. It has a 60.5mm inducer, the T70 part is very misleading.
4. For a little more you can get a Garrett turbo.
5. The turbine trim is close to a P trim. Yes it will eventually reach full boost but with whatever a/r it comes with but if you want to change the hotside so it will come on sooner, say to a .58, you won't be able to.
6. Yes it has a T3 footprint, that shouldn't matter though as changing to a T4 flange on the stock manifold is not any harder than adding the external wastegate and fabbing the exhaust that will be needed.