the spark plugs are Autolite XP Iridium .6mm finewire part # XP5263. ( the advance auto parts in middletown did not stock denso,or NGK.) The SRT-4 is an 05 with 6,000 miles and is bone stock. ( its my wifes car thats why there are no mods yet, but she will give in sooner or later.) The only reason I changed the plugs, is the car would skip or stumble on a cold start and if you put your foot into it at nomal speeds. It did not do this all the time . When I pulled the stock plugs they looked like new, no color on them (lean?) Thanks.
i havent heard of anyone using Autolite on their SRT. So i cant reply to how it benifits performance wise. Many pple here uses NGK, Densos, & some still have the factory still install (RR you still have yours). Their are websites, which you already may know, that you can order from. Maybe some has a set and they can better give ya some input.
My voices can beat-up your voices....
the plugs were the same thred length and over all length was the same. I have no way of cross refernceing the heat range. they are in the car now. it seems to run good. so I'll keep you posted If I run into a problem with them. The guy at advance auto said there is a 5 year warranty unlimited milage. so if there is a problem I'll return them.
autolite specializes in copper core if they do iridium thats cool but be weary about it and at the first sign of problems pull them....I dont know about that patent thing w/ the iridium but it can be swayed w/ design and MFG not the materials used. I think the silverstones were Iridium too. AC Delco makes Iridium plugs ,UberPower makes em, HKS Makes em , they even cross reference copper and iridium, nickel castings and more. SO its all in the design.
td05H turbo 16G =broke until i get more money to finish