Changing the stock exhaust system to an aftermarket exhaust will give your Grand Cherokee a deeper muscle car sound. Find a system that increases the tube diameter and changes or deletes the stock muffler to reduce exhaust flow restrictions. A new muffler and/or resonator should increase the volume and mitigate unwanted drone while producing a deeper, fuller sound not. The MRT Version 2 Cat-Back is a great option for this. If you want deep, throaty and loud, the MRT Version 3 Cat-Back is the Grand Cherokee exhaust system for you.