I am new to the supercharger world & i am learning as i go. I just installed a paxton supercharger on my mopar 360. They want you to run a 1-2 colder plug. Now i have always had good luck with Champions. Some people are going to try to talk me out of using Champions. Ive tried other brands & never had good luck with them but thats with a non supercharged engine. My car will be mostly street driven. With 7-8 pounds of boost. 8.5 compression As of right now i have Champion plugs rn12yc