Having recently purchased a gp.n exhaust system from Demon tweeks, I would like to know if any other members have fitted this system. The system comprises two parts, the back box and inter section which dumps the rear most of the cats. I was told that there was no option but to fit both parts, however, the intermediate section would not fit the existing down pipe, this has led to the discovery that it is not necessary to fit the inter section at all , the back box will go on with no problems. I would like to know if anyone has managed to fit the inter section as I am sure that there are further performance gains to be had.