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Not necessarily. Just a tune. How you get it is up to you. Charlie can tune it or you can tune it.
The EFI is just one route, and the route I chose because I'm into such things. Charlie probably has a tune in his database or can have him do a custom tune based on your mods or desires...
I found nice torque and HP gains on a custom tune by dropping the pulley a touch (extra 1.5 psi boost) and tuning for the bolt-ons and still well within a "safe" zone on pump gas...
Best,
Phil
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