spark plugs on 1999 Mazda B2500

Your web-site estimates a rate for four spark plugs on my Mazda b2500,however it has eight. I`m confused?

Asked by for the 1999 Mazda B2500
You are absolutely right your truck is a four cylinder engine but has eight spark plugs (to lower emissions). I will get this corrected. The labor to replace the spark plugs in total intake and exhaust side is 1 hour.
Sorry for our mistake thank you for bringing this to our attention.
1 more answer , 1 more comment
4 to fire plugs and 4 on the other side to burn off the exhaust.
I have just completed replacing the spark plugs on my 1999 Mazda B2500. I should say that I replaced six of the eight plugs with the wires. How do I get to the two hidden by the intake manifold? Do I need to take the intake manifold off?