I did a fair bit of research on the different dump/front pipes and everything I read suggested that any of the chinese 'HKS' knock offs were shithouse and just not worth it. Then there's the JJR, CES, Advance Headers and AM Performance types.
This forum is full of JJR reports with some reports better than others, CES good reports but expensive, can't find anything from anyone about the Advance (sold by Sinergy) and then the AM has good reports and is reasonably priced and he does discount on a 200 cell hi flow cat if you buy the dump/front. So for me I'm going to go the AM split dump/front + cat as soon as my mrs has forgotten about the $2K I spent on wheels.....