Like Terry mentioned, since the r1200 has two O2 sensors, the AF-XIED kit contains two controllers and two OEM cables. Steve at Nightrider decided to discount the R1200 and make it less than twice the price of a single. As far as keeping either a BoosterPlug or iice air installed, it doesn't matter one way or the other so removal would be the most reliable way to go since it eliminates the extra parts. The reason it doesn't matter is that the BMSK and Motronic use the O2 sensor to learn and correct fueling errors caused by deviations of the other sensors, air flow, battery voltage, fuel pressure, and ethanol content. After a BMSK reset, the BMSK can learn its mixture adaptations a little faster with the BoosterPlug installed if you have properly located its temperature probe inside the intake system so that it is measuring intake air. Since the iice air doesn't have the probe I would say remove it or relocate it inside the intake. Hope that helps.