Love my NGK Iridium IX's... that is after I re-gapped them to .050 (mine came outta the box pre-gapped to .060!!!).I love my NGK V-power coppers.(gapped to .052)
the NGK Iriduim IX plugs were horrible when I tried them and came "pre-gapped" too large(.057). They didn't stay in my car 3 days the idle was so bad.