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Many cars are different. Typically now days there is an active forum for any car brand/model that will have many people giving advice on what the best plug to use is.
Sometimes the OEM plugs are the only thing that works (My Porsche Cayenne Turbo), while other times the OEM plug is overpriced crap and the $3 copper plug works much better (my old Saab 9-3 Aero).
Go visit the Jeep forums and do a quick search and you will get better advice than from CP in this case.
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