NGK (6441-4PK Iridium IX Spark Plug, (Box of 4)

Good price and fast delivery A1

Good but all of them needed to be re-gapped. Checked on multiple gauges and calipers. all 4 of them were too closely gapped. Description said it was pre-gapped .044" more like .036"

Have not installed yet but should be good. used it previously.

Excelente! Mejoró mucho el rendimiento de Civic.

These are the plugs I run in most of my automotive applications. I've never received a bad one. With BMW engines, they'll go 50-100,000 miles, easy. From a nit-picky standpoint, none of the NGK IX plugs I've run have ever had any kind of an issue. No dished-out crush washers, broken electrodes or anodes. I use anti-seize (some people will tell you to do this with NGK, some will tell you to avoid it) and torque to 25-27 foot-pounds; I've never had one back out or come loose, or stripped threads or otherwise hurt the block. These install easily with a standard magnetic spark plug socket. I don't see improved power or economy or any of that typical mumbo jumbo. What these plugs give you is the knowledge that you'll only have to replace them every 50,000-100,000 miles. Compared to copper or platinum, the extra couple bucks you pay per plug will pay itself back not only in the longer lifetime but in the labor you save by not having to replace them so frequently.

Excelente producto, muy recomendable