I took the spark plug out of my 450 and noticed it looked about different then other spark plugs I've seen and I was just wondering if it is a different kind, the owners manual says it has a iridium coated centre electrode but I'm not sure if all spark plugs have that

 

A Iridium plug is a nother type of plug. ie: resistor/non resistor/iridium/etc.
The plugs I use in my race motor is a BR8HIX. The I indicating a iridium plug.
You'll pay 8-12 bucks for one.