NGK (5464) BKR5EIX-11 Iridium IX Spark Plug, Pack of 1

Comment: Have used cheaper plugs in my 2002 Ford Escort (Autolite, etc.), you can notice a difference in engine performance (although that's a highly subjective statement).

Only other plugs I currently recommend are the bosch.

Comment: Definately the best spark plugs I have ever used. Replaced old bosch platinum plugs in my maxima, and I could definately feel the difference.

Comment: I have four of these plugs in my 2002 Corolla with stock ignition and they are Fantastic! I just checked them after 11,636 miles and there is no electrode erosion on these plugs (Checked plugs with a wire gap tool)! I would suggest to everybody who changes their own spark plugs to at least check them around every 12,000 miles or once a year (even if they are long life plugs, reading the plug will let you know about any potential issues with the engine). If your looking to put better plugs in your Corolla, NGK Iridium IX is an excellent choice. Fuel economy on the Corolla does slightly increase ~1% but every little bit counts! Another pointer is to drive conservatively and (if you can) anticipate traffic flow, curves, hills and don't ride the brakes - increase your following distance and let the car coast down the road. God Bless and happy trails!

Comment: This is my second time buying from the Iridium-IX product line for my vehicles. Bought these plugs with the wider .044 gap (code BKR5EIX-11) for my 2006 Scion xB. The larger gap is said to allow for a better spark and improved gas mileage. (As I understand it, timing is retarded slightly to account for lag created by the larger gap.)

Anyway, here is what I have seen so far:

-Idle is now super smooth. Before, the idle would hover near 900rpm and then suddenly drop, then back up again. These allowed for a solid idle that stays around 1k rpm with no dips. The (stock) plugs I replaced had less than 12,000 miles on them, and did not show signs of abnormal wear or other issues...so I don't think they were specifically bad, just not as good as the new iridium plugs.

-Acceleration "feels" stronger and smoother. (no dyno testing or anything....just how it feels to me)

-Mileage has increased. I am getting about 2-2.5 MPG more with these plugs....that's about an 8% increase.....not too bad in my opinion.

Also, being iridium, these "should" allow for a longer service interval before they need to be swapped out again. (Though I will likely not let them go anywhere near the 100k that they can reportedly go....especially since I went with the larger gap to begin with.)

Comment: My Honda Foreman 500 used to be very cold natured until I put this plug in. It now doesn't need to be started by choking much of the time and when I do have to choke the engine, it can be unchoked after starting where I used to run with choke for a while before it would stay running. Great plug.