Thanks for the tip on the Riordan Turbo resonator. We've had the resonator fail, alternator ($1,100 for part alone), leaking fuel fittings, failed idler pulleys (2),transmission leak, two failed A/C/heat blower switches, brake pad warning sensor, EGR valve, even the antenna fell off ($200 for part). This vehicle is parked under cover each night, and has 54,000 miles. I realize the OP wasn't looking for opinions on Sprinters, but I just cringe thinking someone is considering buying another one. Here in the Atlanta area, biggest problem is dealers. They are mostly concerned with getting you a manicure, or a massage, or signing you up for yoga or hitting balls on their driving range, or tasting their gourmet coffee-anything but fixing your vehicle. You can only talk to your service advisor at a scheduled appointment, and don't even think of talking to a technician! OK, thru ranting. I predict that three years from now virtually every class B and B plus that's on a Sprinter chassis now will be on a Transit chassis, and you'll be able to get them worked on at every town in America.
CT51