The resistor actually enhances the spark, there is a split in the use of what plug the Blasters use, some use a resistor plug and some have resistor cap, if you use both it will cut the spark to crap!, I have the resistor cap on mine and if I use the BR8ES it runs like crap!
Everyone thinks the resistor is for "radio interference", that's TOTAL BS!, resistor or spiral core wire is for radio interference, the solid wire on the Blasters will still make noise on your radios regardless of the cap or plug!