I have something important to add to this

finding out the hard way.
Now my 8 came with the hks hard pipe kit, means the j pipe is different from the on in the pic. It's about the same length as the stock 9 j pipe but it's a lot wider as it funnels out to a 60mm bore.... Issue now is that it's right up against the starter motor. I do have a 9 j pipe but that's not going to have the bore to meet the pipework..won't be getting a reducer on a Sunday lol