Inlet manifold is where the air and fuel mixture go into the engine, can be made from aluminum or plastic. The exhaust manifold allow the burnt fuel and air to exit the engine and to be directed down to the exhaust to be silenced before it exits the rear of the vehicle, they are normally very rusty in colour and made from cast iron or stainless steel.Moving on to you ELD, the ELD (Electronic Load Detector) is normally situated in the under hood fuse box and allows the ECM to monitor fluctuations in the charging rate from the Alternator. The ECM needs to know this information so it is able to calibrate the information from the Oxygen sensor to maintain a correct air fuel ratio. The ELD will cause a charging fault if it goes wrong.Hope this helps.