[Lateralus1993]

Are you still stock? If so I wouldn’t recommend going a step colder. .025/.026 would be the proper gap for 1 step colder plugs.

I’m basically stock yes. I had others tell me it was perfectly fine to go with these plugs even if you’re stock. The only mods I’ve added are a CAI and sound symposer delete.

 

[Lateralus1993]

I'd say anywhere between .026 and .028 is pretty perfect. That's where I have my my denso22s set in my Speed6 and I know the gaps are identical in these cars as far as plugs and the Mazdas ecus are way more finicky so Im sure you'll be good.

That’s what I was planning on. Thanks man. And since I have many conflicting opinions, do you think I’m safe running one step colder on a (near) stock ST1?

 

[Lateralus1993]

I just got off the phone with Steeda and they told me I was perfectly fine to run these plugs with only a CAI added, and to gap them to .029-.031