The dealer charged me $500 last year to replace one of these. When the car started stalling like last year I assumed another coil had failed. The price was so good that I replaced all the remaining coil packs as well as the spark plugs. The car drives great. There used to be a Bosch but although these seem to be just as good, who knows, maybe better, time will tell. I did a google search for delphi coil packs and they were all verified as a quality product.