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Good evening. If this is a tinny type of rattle and it only happens at certain RPM's I would look for a loose heat shield over the exhaust pipes. Have someone apply the throttle until the rattles begins and listen under the car with a long screwdriver or a yardstick. Use the screwdriver to push on the various shields surrounding the manifold and pipes until the rattle stops. then use a hose clamp or two to tighten them up. Also I see a lot of catalytic converters that become loose internally and rattle around inside it. The only cure for that is to replace the converter. If this rattle is an internal engine noise you should have an experienced mechanics ears give you an opinion.
a knock from the bottom of the motor is a big end bearing STOP DRIVING, new engine or rebuild required, a knock from the rear of the engine could be loose pressure plate on clutch assembly, that is if it is a manual, STOP DRIVING. a rattle from top end is lifters or rockers but you say its a knock so probably not it. one test to do, remove all drive belts to water pump etc and start if the knocking is still apparent then it is internal and time to consider trade in, rebuild or new engine.