Seems to be newer than the old 03 style Y but older than the HR powered Y pipes. Looks to be nice. The merge collector is much further down than the older style. Looks alot smoother too.

I thought that was a Nismo Y-pipe but I could very well be wrong!

Yeah looks like a Nismo.

i have the nismo replica from ebay. been working great

Yep, that's the Nismo y-pipe.

How does it compare to the HR Y pipe?

Yeah, that certaintly doesn't look stock. Stock is always cluttered with all kinds of extra accessories, screws, stamped plates, insulators, clamps and spot welds all over the place.