I was installing my Apexi WS2 yesterday and in doing so realized that the catalytic converter and the downpipe are probably not going to be able to be reused...if anyone knows of a good place to get stock cats/downpipes let me know...my main question is though, if I cannot find a stock downpipe/cat than which header should I go with if I want a deep sound....also what hi-flow cat or test pipe should I get? I am trying to stay on a budget but don't want anything that is gonna sound bad...if anyone knows what header/cat combo is best for my setup I would greatly appreciate it..( my car is a 99 Integra GSR)......