Just got a reply.
They say it is not for the 1.9 engine..
It's probably not designed for a 1.9 but I would bet that it will still fit,
The 1.9 still has the hangers on the right hand side for a backbox, it uses the same DPF as the 2.4 so the fittings and the pipe lengths of the back end of the system will almost certainly be the same.
The only thing you would be missing is the heatshield above the extra backbox.
the cutout is already there in the bumper (although IIRC there is a piece of finishing trim which covers the cut edge once you have removed the cutout, Others on here have had trouble sourcing it previously but you don't actually need it)
I'd go for it, it's a really cheap way to improve the look of your car.
(I'll be doing it to my 2.0 sometime over winter, just got to check the lengths of the pipes to make sure the new centre section will fit to the existing, I have already checked and the hangers are there already, along with the bumper cutout)