yes im running a magnaflow, im not sure which part number it is but if u have any custom exhaust fabricators around you they are a fantastic help. The supplied the muffler for $80 and did the install on the stock pipes with some minor tweaking around the 2 1/4" choke points for max airflow. the entire thing cost me $150 for what should have cost me around 500. the stock muffler is pretty big, u can go with a number of universal satin stainless or polished stainless mufflers.
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2003 Liberty Limited
Mods: Rancho RS5000, toyo AT's, Renegade Light Bar, Magnaflow Exhaust, K & N Cold Intake Drop In, Westin Grille Guard, KC Driving Lights, Renegade Decals
Cardomain:
http://www.cardomain.com/ride/3072609