Join Date: Apr 2010
Ferrari Life Posts: 2,200
As Andrew said, Iridiums are great plugs but only if your car has a high energy ignition. Their stock gap is usually larger than older style copper core plugs, so if the rest of your ignition isn't up to snuff, you may have a rough running car.
Probably why Ferraripilot recommended more standard type NGK's for you.
I sure wouldn't try to run Iridiums on an older car with a conventional coil and distributor setup.
'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084
High mileage, low compression, and missing on a few cylinders.....just like my cars.
Maranello Skunkworks Team Member