Installed on Toyota Corolla

Try these plugs in my Corolla with stock ignition and they are fantastic! I just checked them after 17700 kms 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 18000 kms 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

What I like
Very good response now!

What I do not like
Slightly more expensive.

Installed on Volvo XC90

Got this NGK Iridium IX for my 2004 Volvo XC90. I was impressed with it's performance. The engine runs smooth. I feel very safe, knowing I've got the best plugs. My wife knows me well as she knows I always do everything in my power to care for the safety of our family. I was impressed that the engine start quickly every time and runs like new. The smooth starts and efficient plug firing also provides the best fuel economy. I am really happy with these plugs, their obvious quality as they make my engine run like brand new one.

What I like
The smooth starts and efficient plug firing also provides the best fuel economy.

What I do not like
Maybe the pricing?

An Excellent performance plugs but not easily available..

What I like
Performance

What I do not like
Pricing

The fuel savings are slight but noticeable, and I definitely noticed the improved engine efficiency. It's also very, very durable and increases engine power. Also, my engine has been running much smoother with these amazing spark plugs under my hood. A definite must buy!

What I like
Smoother engine idle and running. Ggood fuel savings. Engine efficieny is improved

What I do not like
Nope, absolutely loved it

NGK plugs are really the best man. Cheap, but still top performance. Acceleration and idling both quiet and super steady one, mileage also improve, and revving with this plug installed is steady and smooth. No misfires and my car always start on the first try. Confirm must get.

My car has always started up smoothly and the idling is quiet ever since I installed these spark plugs. The acceleration is also faster and no lag anymore! After the seoncd or third tank of petrol I noticed that my mileage actually improved. Best part is that these spakr plugs are very cheap and I can easily get them everytime I go for annual servicing. They last very long as I can go about 2 servicings before replacing it.

recently just changed into these plugs, together with my regular 10k servicing. notice the acc response is better as compared to the original copper plugs. engine sounds less noisy, but there was a slight drop in fc for the first/second tank. will continue to observe if the fc will go back to normal, or even better than before.

A few months after I had these spark plugs installed, I noticed that my fuel mileage was better! The immediate effect was that my car had no more accelerator lag and the engine run smoother. It's 1 yr after install and it still performs like the day I got it installed!

What I like
Lasts long and improve car performance and mileage

The fuel savings are slight but noticeable, and I noticed the improved engine efficiency. It's also super durable and increases engine power. Also, my engine has been running much smoother with these amazing spark plugs under my hood. Die die must buy!

What I like
Smoother engine idle and running also give good fuel savings My engine efficiency is improved

What I do not like
Nothing at all!