I installed this on
Audi A4

Review
I've tried other copper plugs as well as the stock iridium plugs. For those of us who like to "tweak" our A4 1.8T's, these plugs simply can't be beat. Right from the start, I noticed a smoother/cleaner idle, smoother acceleration, and a slight improvement in fuel economy. If you have an Audi/VW turbo, and you have it chipped, get these plugs. The only "downside" is that they typically only last about 13000-16000 miles. But, chances are, if you're chipping your A4 1.8T, you know how to do something as simple as changing your spark plugs yourself. If not, just have your oil change shop do it for you!

What I like
Smoother idling and acceleration.

What I do not like
Do not last too long.

I installed this on
Mitsubishi Lancer

Review
This NGK V-Power Racing Spark Plugs work so well! I feel so confident driving after I've installed them. They even make my car ilde better and put the runble back into your exhaust. Performance gains are really unnoticeable, but this is not a mod to gain more horses. Therefore, you need to make sure you gap them .054 and you'll be all set. Moreover, you can install without removing fuel rails, just need to get creative with extentions on your ratchey. It's really a nice quality spark plugs that I have no regret buying!

What I like
They make my car ilde better and put the runble back into your exhaust.

What I do not like
It's hard to find what I don't like as it's too good!

Review
I installed these on my Honda S2000. I used these to replace the same old ones for foreseen problems. These spark plugs are easy to install. Started right up, with power. On the road there was a significant improvement in power, acceleration and response from the engine. Definitely the best value for your money. The only downside is that they need to be replaced at around every 30k.

What I like
Improves the overall engine performance - noticeable pickup, power and throttle response!

What I do not like
The need for replacing these spark plugs come in quite often.

Review
This spark plug is working wonders in my car engine! It burns very cleanly and it has managed to reduce the fuel consumption slightly. In addition to that, acceleration is much more instant and smoother, and hitting the high rpms is not a problem. Startup is fast too as it starts up on the 1st try.

What I like
Everything is amazing about this spark plug

Review
After installing these plugs, my engine performance improved by a lot. Acceleration and idling is much smoother now, and my engine is quieter and I have never had any misfires.

Review
The idle on my 370z is much cleaner, and the acceleration is smoother now ever since I got these sparks installed. I have never had a misfire before, and I think my mileage is improving.

What I like
Everything!

Review
After installing into my IS250, my fuel mileage improved quite a bit. Also, the pickup is much sharper and faster. It's been a year since I got this plug installed and it's still doing its very very well. Plus, it wasn't very expensive.

What I like
Value for money and improved my mileage. Acceleration is also faster now