I have a Kakimoto full system (no cat replacement) and have just bought a Ninja Back Box. Come to fitting, the pipe which comes out of the back of the Ninja is greatly longer than my Kakimoto. My Kakimoto pipe exit out the back, after about 2 inches, bends then 4 inches or so and thats it, the join for the next pipe happens.

Spose my question is, do i just need to buy a centre section and will this fit straight to the cat? Confusing without pictures!