You won't see the real increase until you have both. I added my PCIII to alter my mapping for the Excel Exhaust but the Ign. mod. is in the future plans if it doesn't get boosted. No worries with this engine and the ign. mod. Just stick with the good tuners. I'll be purchasing mine through Allen @ Ulmer's Racing, if I go that route.
i really could not feel much of a difference, also when regular gas was $4,
premium was to much for me, so i went back to stock i'm happy with the
way it runs.
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