Install the air inlet hat by slipping the hat in the open leg of the fan. Once in, slide onto compressor and rotate clockwise (upwards) while pushing inwards to seat, tighten the clamp. This was not fun. You can use lube to help. Locate cast aluminum air filter plenum with pre installed clamp. Squeeze plenum in-between radiator and supercharger until centered with air inlet. Wiggle and/or turn it into place (This is TIGHT), be sure to leave clamp accessible for future service.