| all that HP potential from the head work is far from maximized without doing the lower plenum to match. Of course that would not explain the loss in power being the same set up you had before right? But it's just an observation.
Last dyno 512 whp 470 lbs-tq On 93 octane @ 17psi Best 1/4 mi on the old engine: 12.59 & 120mph on old steet tires Daily driver, 05 Titan KingCab Tow package, 2.5" lift kit.
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