Yonaka Exhaust??

I saw this exhaust on the net and was wondering if anybody has purchased it or heard anything about it? If so i was wondering what it sounded like and what are the performance gains from it. For $398 it doesn't seem that bad.

This is where I found it:
http://www.jspecautosports.com/catalog_product.aspx?prod_id=210

one statement made me dislike it 10 seconds after looking at it ..."This system consists of 2.25 diameter"....all this basically is , is a good lookin stock exhaust!

If you're serious about the Hahn turbo in your sig, or any turbo, larger than 2.25" would do you good.

If you stay NT and the thing doesn't kink or otherwise constrict, 2.25" or 2.5" could be good.

I don't know of anyone running that particular exhaust, on this site or otherwise. I'd ask for pictures of the actual exhaust for the RS. A picture of the axle back doesn't tell you much, especially when it could be generic to begin with.