as its a manifold cat youll get £15/£20 for it as they are worth less then a normal under the car cat the scrap dealer will be able too tell you what is worth with out cutting it open as they have too go on a course an learn the different grade of cats! after market cats (non genuine) are worth £2 as there crap in side they can be told by the large flange round the ednge where the top an bottom of the cases are welded together! hope this helps
i am guaging the prices on what we get for cats etc round here the prices change all round country an what scrap dealers are in the area etc i usually find the further north in the counrty the higher the prices