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opinion on colder plugs

T

tjvdubsport

New member
i have a 98 GTP with FWI and was planning to get 605 Autolites which is 1 step colder from the stock 606 , will i get a bad fuel mileage ? or am i getting some performance ?
 


you dont need colder plugs unless youre going to drop pullies and run more boost. stay with the stock heat range.
 
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