That is a small turbo, it is good for around 250hp and u can run around 15 psi on it. It is smaller than a t28 and should spool well. It is Way Way smaller than a td05, it around the same size as a td04l. My friend had on on his sentra for a long time very strong when well treated.
Correct me if I am wrong, but I though ar ratio is the relationship between the wheel and the housing and does not directly relate to the size of the turbo.