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A quick look tells you they are of great quality which I've found all Bosch products to be. The plugs that I removed, although good plugs showed signs of uneven wear and odd firing patterns. The Bosch Fine Wire Double Iridium plug is designed to prevent this by the design of the fine point primary electrode and the tapered, and precisely formed ground electrode which puts the very point at the point of gap. In older vehicles you could tell if your plugs gave you anything extra by the RPM, however since the RPM is controlled by the computer this is no longer necessary. However, the idle was definitely improved by the addition of the new plugs, Well worth the extra money!!!
Verified purchase: Yes | Condition: New
You can feel the difference straight away so much better pick up and running smoother.
Verified purchase: Yes | Condition: New
The Bosch Double Iridium 9664 is a excellent fit for my 2004 Jeep Grand Cherokee.
Verified purchase: Yes | Condition: New
Excellent Product
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
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