Which Denso????
 

on the Denso iridium site there are two spark plugs and they both say mazda protege 1.8L L4. which one for a 1.8l sohc automatic????? IK16 or Ik20


http://www.densoiridium.com/findmypart.asp

if you look up a 93 protege it just gives you IK16. dont know what the other would be for. :dunno:

IK20 are colder than IK16

??????
 

So which one should one use??????:dunno:

IK20 is said to be the normal plugs to use. Thats what I normally sell.

I havent tried the Densos yet but I have a set coming in next week to test out. But so far the people that I know have put the Densos in have noticed an increase in power & performance. Now they arent claiming any huge HP gains but they say they can feel the difference because the Densos fire better than other plugs. I dont know, I havent had anyone dissapointed in the Densos that I've talked to (and none where running turbo or anything major) & most actually liked the plugs & felt they where money well spent. They should also last longer than cheap plugs so you wont have to replace them as many times over their life. This may not show any value right now but a ways down the road when you are running the same set of plugs instead of going through 5 sets of other plugs, you'll start getting closer to the same price. But, like I said, I havent tried them personally yet (I'll post as soon as I get them in) But I think you can waste your money on worse things so this is a nice upgrade that isnt too hard or major!