The iridium spark plug provides a quantifiably better spark according to NGK, but I can’t give you numbers for increased performance. NGK is the industry standard for spark plugs. Sold individually.
Fitment Guide –
|S1, Cyclone, S3, M2, X1, Ulysses, XB12S, XB12R, XB9S||DCPR8E standard or DSPR8EIX Iridium|
|S2, XB9R||DCPR7E standard or DCPR7EIX Iridium|