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DCPR8E NGK copper. we use stock gap and change every 10k-15K miles. So far so good for me. 12psi fyi.
I still use stock gap on my DCPR9EIX on my turbo R with no missfires.
Running NGK DCPR9EIX gapped to .022" with no misfire issues.
The 9s are good. Considering I have run them anywhere from 15psi to 36psi of boost and they have performed flawlessly I would say that they work well.
I replaced the spark plugs earlier. The new spark plugs is NGK PFR6Q from Checkers. It is gap @ .032. The old spark plugs are the very cheap Autolite. The previous owner probably tried to save money, but it end up cause me a lot of trouble. The gap of Autolite plugs are more like .042. I drove it a couple blocks I installed the NGK, and it felt better.
Or ngk brk8eix. Thats what im using and they are great.
I went with iridium's,and like the millage ,performance...
With the BKR5EKU plugs I got apx 27-29 mpg. All stock except for a neuspeed chip.
Napa usualy is the only parts store around me that carries NGK in stock
I changed over to the BKR7E model to see how they worked. I wasn't impressed because after that the RPMs on my tach wouldn't stay steady at idle.
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