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?
