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Here's some info. 1- The waste gate controls the boost pressure, i.e. it opens at .8 bar on stock systems or you can install an electronic valve controller such as HKS to allow boost to be adjusted. 2- Yes the little muffler looking thing is actually a cat and is required for smog purposes. 3-Running with the pipe off will just allow the gases to blow onto the underside of the left rear fender, engine, etc and make the car not smog legal. 4-As for the rattle, check the mounting bracket from the stosk system to the engine or remove the stock muffler/cat and shake it as a baffle could have broken loose inside. Try listening to the system with a stethescope or long screw driver to see where the noise is.
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