Bob I'm not convinced that is a production GT4
It isn't a GT4 rear wing and doesn't have those alloys you like
It doesn't have the race fuel filler
It does have the sills and canards, but also has V12 alloys and bonnet
It also has USDM side markers unlike the GT4
Also a GT4 is V8

This is a GT4

 

I think Bob meant it was a genuine GT4 wing, not that the whole car was a genuine GT4. If you look at the other pictures in the link provided by the OP you can tell that it is a regular V12V that has had some racing bits added on. The size and shape of the wing can vary depending on the racing series, so it is indeed possible that it is a genuine wing.

Here is a picture I took 2 weeks ago of a genuine GT4 with a wing different from the one you posted and which more closely resembles the one in the original post:

 

wrong wheels
sloppy lowering job
no spacers
wing is silly without garish graphics (from actual sponsors)

It may be a swell track car but it looks more like an albatross to me.

 

I like it with the livery. I'd never buy it or do it myself but I think it's unique looking

 

I thought he was referring to the canards? And from what I've seen on their website and the cars in person, all of the V12 cars have the canards.