been doing some reading checking the FAQ and appendix. in regard to the pic I posted. I'm guessing the 2 outside pieces are the catbacks, what is the center X pipes? or are they all together the catback? Where do the testpipes fit in relation to these 3 pieces. I'd love to see a full diagram from downpipe to tailpipe. that would clear up everything in my head. you're been great I really appreciate it. have a great weekend