I have a dcrh, what to I need to install it? Do I need a new gasket to go between header and catback? I've been told I need to wrap some things with heat resistant tape, what do I need to wrap, and what kind of tape is it? I want to put a catalytic converter on the header. Can one be welded directly on the header? Can the header be installed without the flexpipe, because there doesn't appear to be enough space to fit a cat? Where is the best place to buy a freeflow cat, the best i've found is 70 for a vibrant cat. Thanks for all the help.