Owner reviews for spark plug

I'm running NGK BKR7E plugs, gapped to 0.028 with APR's K04 program and its working fine.

im using the denso 1k22 great plugs for ko4

There was a considerable difference when I installed my new NGK plugs. My engine revved up easier and the fuel efficiency increased.

i put a heatrange colder (bosch FR6 because i can't get the ngk's local) in my bro's chipped 337 and it ran a lot smoother

good plugs, cheap, and I get zero misfires at 0.028\" gap on a chipped K03 Sport.

They work beautifully. I've been using them for the past 24,000 miles. I change them every oil change (hey, they're cheap) and they seem to be the smoothest that i'v tried.

28R, NGKBKR7Es - 0.028" Change every 8K miles. Only $2.30 a piece, and I run lots of race fuel

i put in some 3922s and i can hear it misfire when its idling, but it seems fine when im giving it gas.

I was running the junky ford plugs with little to no issues and switched to those NGKs and now I will actually foul a plug in warmup. This has never happened before and I would venture to say they are my least favorite plugs at this time. I have never had these issues until the NGKs.

i just changed my spark plugs, figuring i would do a tune-up before winter..the car was running fine before..changed the oem plugs that were in them to bosch +2's..well that was when the misfiring started...the car at low rpm's, lets say, 1500rpms, would stutter if i tried to full throttle it,...but when i get to about 2500rpms the stuttering would stop