: Iridium Spar Plugs

05-29-09, 04:08 PM
Does anyone know what type of plugs are in the 05 STS V8. Assuming delco but doubting Iridium. Has anyone tried iridium in this car? I know Bosch isn't a favorite here, but anyone tried the Bosch IrFusions? Any opinion on what would be the best performing plugs for this car? Delco Iridium? Bosch IrFusion?, something else?

05-29-09, 06:15 PM
I think they are Platinum tipped. A/C Delco 41-987