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well... from what i was told i dont know how completely true it is my stock head. it isnt built at all. i was told to up grade my valves, springs, and retainers otherwise the egt would melt the stock valves. and to be honest i dont think i want to go over 15psi. i guess since since it working great i dont wanna mess it up.
my tuner had told me to go with these colder plugs and the car runs smooth so ... im just gonna stick with them. i used to have 1 step colder which also worked well. he put em in there when he did the tune so i went w/ it.
nikolai.. i dunno yet. i havent really looked around for a new exhaust yet. any input please lemme know.
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