I am a little curious on this subject. I dynoed my car with just a mac offroad h and a mac 3" exhaust and got 361rwhp and 349rwtq. I only had a 10-15min cool down time and the weather was very humid with a whopping 97 degrees. But my question is, do you think i dynoed low because my o2 sensors werent connected? Your probably asking yourself why I didnt have them connected. Well the reason for this was I had installed my h-pipe a few days before the dyno run, but the o2 sensors towards the back would not reach. So my friend decided to leave the front two disconnected also until I get my MIL eliminators in and the extensions. Anyways, I dont know if my dyno numbers were low because of not having the o2 sensors hooked up? If it did rob me hp, how much would I have gained with em on. Its kinda a stupid question, but I was told you ask the experts on the board to see what they would say. Thanks!