- Joined
- Jan 1, 2000
- RO Number
- 385
- Messages
- 2,884
NGK now has applications for their Iridium plugs. I tried a set today in my 7.4 MPI. While not dramatic, idle was smoother, but then again it always is after new plugs. Long term, looking for a small decrease in fuel consumption. Anyone have any experience with these plugs?