Are you willing to modify a pipe yourself, youll also need a sutiable map to accomadate the decat.
 
I think there have been people who have them, but it calls for stage 2 revo, or other remaps, in order to be able to bypass the second lambda sensor, other wise the engine management will throw a hissy fit.

Have a look through previous threads, as iirc people also found that going from a race cat to a straight through, they seemed to loose power.
 
A friend has one for his mk3 cupra. Not got around to fitting it yet as i told him he needed to adjust the chip etc first. Got it for £30 from a scrappy, propper s/s purpose made one but no manufacturing mark to say who made it.