Bp5es vs bp5res is there a functional difference

[mspirito]

Is there much difference between the two spark plugs ? Is the R just for the radio?

[Bill Verburg]

Originally Posted by mspirito

Is there much difference between the two spark plugs ? Is the R just for the radio?

One has a resistor built in the other does not

In stock 911 wiring the resistor is in the plug so you would normally use a non resistor plug

the resistor is there to quell RFI