Review on 🔥 DENSO #3417 Iridium LONG LIFE Spark Plugs - SK16HR11-4 PCS Brand New, High-Quality Performance Plugs by Michael Tegan

The plugs I received (left plug in photo) didn't look original to me so I bought a set of identical Denso plugs from Toyota to compare (right plug in photo). Turns out the kit I received didn't have a blue iridium center electrode tip. The measured resistance of the center electrode is only 2.6 kΩ (should be 5 kΩ according to Denso specification). The white ceramic around the center electrode tip has a poor finish. The thread size is slightly smaller than the kit I have from Toyota. I don't know if these spark plugs are COUNTERFEIT or spark plugs that didn't pass quality control and are sold as a tier 2 product, but I definitely don't want to put them on my car. Please check yours when you buy plugs here.