I need to just get the section that goes from cat to the back box as it is all rusty. I have an original back box that was replaced two years ago for something stupid like £400 genuine. Dont see the need to replace it! I have just bought a scorpion de-cat, so will put that in the with the original system. Is there any company that sells just the link pipe from decat/cat to the back box that can be put in place. Or is it custom all the way?