STEVE ,PUTTING THE BOSCH PLUGS IN MAY CAUSE YOU A LOT MORE GRIEF THAN THEY ARE WORTH ,THOSE ENGS ARE VERY SENSITIVE TO THE PLUGS THAT THEY ARE DESIGNED TO USE AND BOSCH IS NOT ONE OF THEM , IT VERY LIKELY CAME WITH THE CHAMPION NO 7346 PLATINUM PLUG ON THE NGK VERY FEW CAME WITH THE NIPPON DENSO, THE BOSCH CAN ALLMOST GUARENTEE IT WILL THROW A CEL BEFORE LONG AND A MISS FIRE CODE .. JERRY