Why would the stock ones be best? Are the Chrysler Engines really that cheap?
You will see no benifits from those E3/+4 plugs which the correct plugs that your engine was designed to run won't give you and a 1/4 of the cost.The engine are not cheap just designed to run on cheap plugs saving you money.You can change your plugs 4 times for the cost of one plug change of those snake oil plugs like the E3's and +4's.
'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
I've ran the Autolites in mine for the last 130,000 miles switching them out every 25-28,000 miles, never had one problem
Now I have taken a brand new set of those fancy E3s out that someone else put in for a neighbor, they lasted all of a week before he came over asking what the problem was with his. Since I keep the Autolites in stock threw in a set of those, 2 days later he stopped and said it hadn't ran like that since it was new.
04 Liberty, Kilimanjaro Edition, Rock Lizard RockRails/Roof Rack/Front-Rear bumper,32 inch Goodyear Duratracs,Moabs,4.10s/ 4.25 inch JBA Coilover lift /other goodies