The variable pitch winding (loose/tight/loose) provides suppression throughout a very wide range by "scrambling" and breaking up the electrical waves radiated by the firing of the spark plugs. NGK Wire Sets are numbered for easy cylinder identification and coil wires are color coded for correct and easy installation.
Very good deal. Had all I needed to tune up my 1998 4 runner 3.4. Cheap to buy the parts like this them one piece at a time. Good to know all the parts are changed under the hood.
Each boot in town is like 35 bucks and the wires are 55 this worked out to Good and my 4runner feels so powerful I'm at almost 300000 miles and feels like new with setup thx