I just put the petronix II on my car and went with the .6 ohm coil,ignitor....45,000 volts. The petronix I requires the 3. ohm one which is the stock ohms on a regular coil. I called petronix and they explained that to me... Regap your plugs also 40-45. Pretty easy job on the ohc 6. The ohc cammer 6 web page has a great pictoral on the installation..... Ron