Download Remove the original air filter boxes by loosening the hose clamp, unplugging the electrical plug, and removing the air box retaining bolt. There is only one bolt securing each air filter box and they will release from the car by firmly pulling up on them after the single bolt is removed. 2. Transfer the MAF sensor from the original boxes to the new Pop- Charger air tubes; the bolt patterns are offset so you cannot put the sensors in wrong. This is a good time to remove the filter elements from each assembly and make sure there is no packing material or other foreign material inside the assembly before installation.