Where is a maniflod - 2000 Nissan Quest

There are two manifolds on your engine. One intake, where the gas and air mix and go into the cylinders. One exhaust, where the burnt fule is sent to the exhaust pipe. Depending on which one you are looking for, look in the center of the engine for the intake, and the side with the pipe running to the back of the vehicle for the exhaust. Hope this helps.