Spark plug NGK or AC DELCO

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.

I'm flashed with Revo Stage 1 and I run NGK BKR7E plugs gapped to 0.028\". They are 1 range colder and are cheap ($15 for 4 at Lordco if you have a discount). Only downside is that you should regap them every oil change, and change them ever other oil change

I changed the plugs thinking that what it was. (it was not). I thought it was the coil packs so I bought a new set of four, which I have NOT installed yet.