It's an AWE thing. Presenting the Best Sounding Exhausts on the Planet for the JL/JLU Wrangler:The Jeep Wrangler exhaust that will sound good no matter where you are on the planet. Handcrafted from US-made 3 and 2.5 T304L stainless steel, the Tread Edition is a straight-through axle-back configuration for drivers looking for rugged performance and a drone-free, signature exhaust note without sacrificing daily-drivability. The Tread Edition features AWEs patented, drone-canceling 180 Technology, which provides the JL/JLU with a sophisticated, full-bodied soundtrack completely controllable via the throttle. With increased throttle, the Wrangler roars with aggression, but at highway speeds, the cabin is free of any drone, and volume is similar to stock. When it comes to bringing up the rear, drivers have a couple of options. Say goodbye to the ugly suitcase muffler and dangling tail pipe, and hello to dual 4.5 double-walled, slash-cut tips in either Chrome Silver or Diamond Black.