I have a couple of car chargers with the micro usb plug. One is the Sprint Rugged and a cheap knockoff from ebay. I connect my Evo to my car stereo using a 3.5mm aux jack. When I have the charger connected I get a great deal of EMI coming thru the speakers. There is less with the Sprint Rugged than the cheap Chinese one but the EMI is still there, an noticeable. Is there a car charger of top quality that won't add to the EMI? Thanks!