The intake-air temperature sensor is taken out of the original intake manifold and installed in the air-intake elbow. Just drill a hole in the elbow and push the sensor in and put some silicone on the outside to seal it up against air leaks. The elbow fits onto the throttle body but it is tight against the firewall. A new air-intake hose is supplied with the kit that locates the air filter on the outside of the brake booster alongside the master cylinder. There is a vacuum tee supplied near the base of the throttle body where the vacuum line from the brake booster connects. Make sure to use the check valve when hooking up the heater controls so your heater and defroster will work when driving up a long hill under boost.