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Old 11-15-2015, 05:29 PM
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4.0 mods

Hey fellow Jeepers,

Looking for answers about some performance mods i would like to make to my 99 tj 4.0. My question is if i put in a comp cams 252 and a bigger valve performance head from 505 performance what kinda hp improvement (ball park) will i get? Also curious if i should the 24# injectors and 62mm throttle body with a piggyback chip?

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