Hello, I have seen where some of this has been addressed but I am looking for responses to the following. I have a 2012 ultra classic bone stock no mods. 1. Does the removal of the cat affect O2 sensors or ECM in any way? 2. Does the removal of cat void warranty? 3. Do I need to add some type of fuel controller after cat removal? 4. I would like to add slip-on's how will this affect performance with cat removal? 5. Would it be best to purchase header pipes with cat already removed and save the stock pipes? My goal is to have the engine run cooler and to have a better sound with some gain in performance. I am not looking for pure performance just reliability. Thanks in advance for all responses.