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Re: changing pulleys
All you need is the proper puller.
Been done on many 04's
3.4 is the lowest until further mods ie exhuast/intake/cam/rockers/intercooler and on and on
W/ intercooler and the right tunning sub 3" pullies are norm
W/ a 160 you should still see lower temps, dont know if that low of a tstat will throw codes like it does on some of the other GP's
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