This review is from: 8 New DENSO Iridium Spark Plugs IT16 # 5325
Plugs are as advertised with very small diameter center electrode and shallow groove in ground electrode. I've been running it in my 4.6L SOHC Mustang for 400 miles now and it does not miss a beat at any RPM and any load. Since I did install performance coils (MSD) and wires (MSD) at the same time, I can't give all the credit to the plugs. My mileage has increased approximately 10%. The manufacture quality of these plugs is noticeably better than the domestic brands.
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