Unsure about your particular model bu the rattling exhaust is ususally caused by a worn or broken muffler mount which is basically a big rubber loop which stretches to connect the muffler to whatever hangars are provided. This should be a quick fix by buying said mounts... just check what kind there is already.
Concerning the leak, there are patching compounds/kits etc. It would be good to find out where the leak is prior to purchasing anything because different leaks require different solutions. If it is not making any excessive noise it is most likely just a loose joint which they sell a compound for which should be available at any auto oriented store.
Concerning the speedo, I agree with llow.. assuming that it is cable driven(most likely).
__________________
boom
|