So the B-pipe should fit right into the JDM header? or do I need the Cat go between.

Another thing: I went to the performance shop just to check it out and I ask this guy about which cams will work good for my car and he told me that Toda will work good but I 'm going to need the valves-retainers(wherever). and another guy toll me that I don't need both cams that intake will do it. is the true?

"sorry if I have any errors)"