I purchased it for preventive repair. The product is a maker item, each code has a number attached, you can rest assured that it will not be mistaken for installation. The price (including shipping fee) was also inexpensive as compared with other mail order companies.
One plug cord died, the spark did not come out spark by one cylinder in the plug, vibration, rotation became unstable, so when looking for parts, I bought it because the power cable was less than half price. At the same time replacing the plug with Denso Iridium tough, the engine became better like a different thing, the low speed torque became thicker, the fuel consumption improved by more than 20%.