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The NGK Iridium IX is a single resistor-type spark plug with a fine iridium center electrode and a platinum-tipped ground electrode. The fine tip concentrates the spark and resists wear, so it holds its gap longer than a standard nickel plug. This version is gapped at 0.027 in and sized for 1.2L turbocharged direct-injection gasoline engines. It suits drivers replacing plugs on a small turbo engine who want a long service interval; it is one plug, so a full engine set means buying several.
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Lowest price we've seen: $9.12 on Nov 10 at The Twister Group. Tracked across 3 stores since Nov 10.
Owners of small turbocharged engines report smooth idle and steady running after fitting these plugs, and many note they last well past the usual replacement point. The main complaints are the single-plug packaging and the higher cost than basic plugs.
The NGK 97977 is an Iridium IX spark plug. It is a resistor-type plug with copper and platinum construction.
The plug has a gap of 0.027 inch. It is sold as a single plug and fits 1.2L (1199 cc) turbocharged direct-injection gasoline engines.
