well im wanting to be able to pass emissions without removing the DP and putting the stock back on, dealing with any bad MIL eliminators, or any other home remedies that people say work....also, i dont know anyone were my car is registered (Iredell county, NC) that will inspect a catless setup.....so im gonna try and go legit.....ive thought of ever possibility and the best was to buy a high flow cat.....but, thanks for the input guys!!!!