If that part number is correct, it's just an OEM Nissan SR20DET turbo, notice the p/n he listed is for a t-25 not a t-28, wth man? Yeah it's the nicer b/b turbo, but it's not a t-28 at all, unless that was just a massive typo.

http://www.turbobygarrett.com/turbob...R_466541_1.htm