I was wondering what spark plugs I should run on my Evo 9. It has a few bolt ons: speed density intake, 255 walbro, upper and lower ets piping, tial bov vta, full exhaust, map O2 housing. Putting down 360whp tuned on pump gas. Name and part number would be helpful. Thanks in advance! Also the right amount of gap would also help.

 

NGK Laser Iridium, ILFR7H

 

NGK ILFR7H

gapped at .020"

 

I noticed no one said anything about Denso

 

Denso is a cheaper alternative to the NGKs but seem to work just as well as far as I've read.

 

Way cheeper especially if your going colder. 👍👍

 

I prefer the NGK than the Denso.

 

NGK ILFR7H for sure.

 

Thanks guys! I bought all four of the NGK ILFR7H plugs for 37$

 

Denso's work well, I find they have to be replaced sooner than the NGK's

 

This

 

I though they already come gapped?

 

NGK ILFR7H gapped at 0.022 for me. ~550whp on e85.

 

The last set of ILFR7H's I got were gapped at .030 out of the box. I had to adjust them to get them down to .020

 

Even if they come "pre-gapped", check them with a feeler gauge (not one of those stupid coin gauges)