#1 is the connector to the flapper solenoid. #2 is a vacuum line that used to drive the flapper system. It connects to the throttle body, and people either plug up the hose or remove the hose and plug up the nipple on the throttle body.
For noise control, the air intake has this plastic flapper that closes at low RPM and opens at high RPM/load. Disabling it is supposed to help the motor "breathe" better at low RPM's.
For noise control, the air intake has this plastic flapper that closes at low RPM and opens at high RPM/load. Disabling it is supposed to help the motor "breathe" better at low RPM's.