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.
i use NGK G-power plugs in all my vehicles and they are the best ive found. they are about $2-3 tops and last forever, i have no complaints about the performance either.
I got on my last long trip 29-30 mpg doing 75-80 mph
I'm using the OEM Bosch spark plug. I gapped mine to 0.024" as per Bentley and the car seems to run fine.
Cooler plugs (NGK BP7ES) gapped first to .028, then to .025 have changed NOTHING.
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