1. Sound deadening in the hatch - Dynamat
2. Have resonators welded into the new piping - Vibrant
3. Put your muffler back on
These cars drone because of a serious lack of sound deadening in the interest of weight savings, even with full brand-name exhaust systems. It's why you can hear the gear lash and every other little noise the transmission makes. If you don't want to put the muffler back on or buy resonators to add to the muffler delete pipes, pick up some Dynamat, remove the hatch interior plastics, and apply it to the chassis.
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