a second opinion

[got_psi]

so im running a EBC, 8psi on low tune, and 9.5 on the high tune, and im sick of my junk 1 step colder iridium plugs, so i am going to roll back to copper, however, i dont know if i really have to run the 1 step cold being under 10psi and the days here in Maine gettin 40-50 in the mornings (when i drive most). i would like to get a nice NGK, but i have heard good things about the AR3924 autolites (stock range). just need a bit of input on if i will be alright running stock heat range. mods are ssafc, catback, 626 coilpack conversion, ngk wires, hardpipes, cai, awr, ebc, and ssqv

 

[got_psi]

If need be for a step colder maybe NGK ZFR7F?

 

[CHIQLES]

I run stock range ngk spike at 10 but run 8psi. I keep tabs on my air temps after my intercooler though so anytime im around 105+ on air temps i tend not to boost. But this is just me.

 

[got_psi]

I run stock range ngk spike at 10 but run 8psi. I keep tabs on my air temps after my intercooler though so anytime im around 105+ on air temps i tend not to boost. But this is just me.

noticed you run the air to water IC, how does that work out?

 

[BOOSTR]

Here's my opinion you don't want anything but NGK nor do you need 1 step colder plugs in your application. I've rolled over 104K miles at different boost levels. Each time I pulled the plugs to change them they never showed any signs of problems. Simply normal wear is all. I use the NGK stock no 4291 plugs.

 

[mazdaspeedp]

Ya just roll with a nice set of ngks. I think crossover has a nice set msp specific. I really doubt u need the step colder.

 

[CHIQLES]

Good, a little more up keep but good.

 

[hornsfan10609]

I agree no need to go to colder plugs unless you turn the boost up above 10psi. The stock ZFR6F should be fine.

 

[got_psi]

worked great!! thanks