It's very interesting talking between HD dealers and Power commander on whether you need the O2 sensors installed, removed, need the eliminators, need wide band optimizers? PC said if the O2 sensors are still installed the PC doesn't actually do anything. I was also told by many it doesn't matter. Then others said you don't need the eliminators, but PC says you do need the wide band optimizers/eliminators. I don't know what is right or wrong anymore, and wondering if anyone can give me the real deal? PC seems to point to HD, and HD seems to blame PC. HD wants to sell SERTs I'm sure, and PC wants to make sure they aren't getting bad wrap for a bike that runs like crap. So, does leaving the O2 sensors installed negate the PC operation? If you unplug the sensors, should you install the wide band eliminators? Maybe the auto tune is worth the cash and solve all this crap! I wouldn't think a dyno tune is needed for slip-ons and a high flow AC. Thanks!