If you’re asking about brands, I always go NGK. They’re definitely my preference. They have a coating on the threads and don’t require grease when you install. And they come pre gapped.
I've ran these for a few years stage 2 e85, with absolutely no issue at all. The last year and a half I've been running a bigger turbo, powermax 2260 and have had zero issues
Been running them for the last year on EQT stg 1 91 and e30 with no issue.
NGK !!!
Next day guy at the auto parts store tells me to try ngk iridium’s and it works automatically. If you’re planning to replace your spark plugs save your self the time and money and buy ngks over anything.
I replaced the plugs again (from Brisk to NGK R7437-9) and rotated the coil packs to try and resolve the misfire issue. I also re-flashed both the ECU and TCU tunes, and the cold start misfire issue appears to be fixed.
Atualmente uso velas e bobina NGK. Perfeitas.
Check out Brisk Silver Racing (listed as an option by EQT). You’d have to replace them more often vs iridium, but they are super inexpensive and more performance oriented (conductivity).
Brisk are fine. You have to check them about every 5,000 miles. And change out sooner than other brands.
Replacing a motor is not fun, nor cheap. That was with 9006 RS7's btw (your current plugs).
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