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I wouldn’t run stock HP manifolds if you gave them to me. I went from factory HPs to hooker comps on the mild 440 in my Charger and the difference was almost like swapping from a 2 barrel to a 4 barrel. On my 451, I obviously have headers, and I’m even intentionally running a long case 1.8kw factory starter (for the sound). I haven’t “left” manifolds on any of my 30+ Mopars in 25 years.
