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I do have to say, Sir, this is one of a hell build! Good luck with it I really hope to see it putting some serious numbers @ the Dyno & track! I have prepared for a similar build but with different supercharger... Now I see that they sleeved the block for you, curious what bore did you go...

I have almost same moods but with XBA/kb148 and dd149 intake so maybe I'm pushing 1.5-2psi more than you, I'm using TR7ix gapped @ .26 but that's my tuner recommendation! If I were you I'd try them gapped to .28

Yes I run headers but with 93 octane/meth .. sometimes I add torco but haven't tried e85 yet

I got tired from replacing my O2 sensors maybe the extensions was affecting their longevity? So I replaced them with the longer version I think part No. was NTK 24326 and they are running good for almost two years now! They are made for f150s but they also fit my 13' gt500...