What kind of plug should i put in my bike and is thier any " PERFORMACE PLUGS!" ? Thanks alot ... plz list the number of the plugs.. thanks

 

i like the stock ngk dpr8z plug. however they make a plug made for high speed riding that is suppose to keep the bike a little cooler. this plug is a dpr9z. i run this in my motor, but i also have a high compression piston, cam, full pipe, jets, etc. this drp9z is a colder plug so it will make the bike harder to start and it may run a little rough until the bike gets warmed up.