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In the muffler itself there is a butterfly valve that increases back pressure with additional restriction. It is operated via a vacumn solenoid, easy to see if you dip your head under there. The vacumn line you will see goes up into the car itself and of you remove the cubby liner in the back left corner of the hatch area, it exposes an electric solinoid the vacumn lines leading to it and to the vac solinoid attached to the muffler. Pull off the one leading to the muffler, and pop on either a little vacumn cap or a piece of similar size vac line with a dowel or something of your choice and you are good to go. It adds a little tone to the exhaust note that is mostly noticeable from out side, but you get a little more tone inside as well.
Being that you are up in the great north, at least you've got the fun cold air. We're still running the A/C down here.
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