Thinking about changing my exhaust soon to a 2.5 inch de cat and a Tanabe concept g, has anyone had any experience with this exhaust? I have been told by tokyo express that this exhaust is a very light, high quality 304 stainless and with the de cat could gain me 10 hp? Have been quoted £530 4 the exhaust and 60 for the de cat if i buy them at the same time. Any views welcome.