I am currently running a HKS Super Dragger cat back system. I am trying to get hold of another back box for the other side of the car but need to change the downpipe to get the real noise out of my car. Can anyone recommend a downpipe ? should i stick with HKS or are there better 1's on the market ? i have to have a center system made anyway to split to the 2 backboxes so i'm open to all suggestions