I need to sort out a set of stainless frontpipes for my NC23 but can't afford to spend a fortune on my bike at the moment.

I came across
these (on page 10)
the other day but have not seen them before. Normal price is £220 for a set of NC23 pipes but I found a company selling them, on special offer, at £139. It says they are copies of the originals so I presume it is a 4-2-1 system but can anybody confirm this?
I can't find a website or contact details for the manufacturer, else I'd contact them directly.
For sale here for £220
Any help is much appreciated.
Cheers. :D