What oil are you running? The knock after warm up is from the oil heating up and becoming thinner. Try running a "thicker" oil and see I it helps with the knock.
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06 Inferno SRT-8, All Options
Mods: Kooks headers, High flow cats, Inertia SRTmax cam, Magnaflow catback, DHM low pro cutouts, SLP pulley, 4" Bwoody, Bwoody springs/links,Stillen covers, R1 drilled/slotted rotors,De-badged, Interior led's, 8000k Lows & Fogs,Dynotune (RDP)
On Order: Heads, Intake, Custom made 22" Giovanna Dalars