I just had the resonator and muffler replaced on the e320 coupe by a local exhaust shop. On the 2 mile ride home, a noise developed from the rear wheel. Turns out that the rear lug bolts were not tightened on the drivers side wheel. One bolt fell out in my hand when I went to tighten them. Wow...lesson learned. Check the car after getting work done! Going to call the shop tomorrow. Not sure what approach to take. Thankfully I didnít jump on the freeway!!!