I'm in the middle of the install of my KB S/C kit and noted that the part number of the spark plugs I received from Sparkplugs.com is IT16. The Denso
spark plug chart included in the KB S/C installation manual says that for a '00 Mustang GT the spark plug part number should be IT20. What's the difference bewteen the two? Can I proceed to install my IT16s or should I have them replaced for IT20s? Please advice.
spark plug chart included in the KB S/C installation manual says that for a '00 Mustang GT the spark plug part number should be IT20. What's the difference bewteen the two? Can I proceed to install my IT16s or should I have them replaced for IT20s? Please advice.

