I was trying to find some sparkplugs. But there was 2 choices Leading or Trailing. I dont know which one to get. What is the difference. How do you tell which one i have?

 

u get 2 of each. The Trailing is for the 2 on the top and Leading the two on the bottom.
try www.mazdaformance.com or www.mazdatrix.com for plugs

 

You get two of each. When installing, the bottom ones are the leading plugs, the top ones are the trailing plugs.

 

You need two of each plug. Trailing plugs have a T and two blue strips on them and are the top two plugs. Leading plugs Have an L and are plain white. They are the bottom two plugs. Make sure when you change them you do not mix up the wires make sure you mark your front wires and rear wires. If you have the factory wires the fronts have a white piece of electrical tape on them. If not just mark them yourself.