I own a 2015 SS LS3. I installed 1 7/8" LT headers, CAI, 3" exhaust, no cats, Granitelli Zero Resistance plug wires w/ Iridium plugs. Made 423 rwhp and 427 Tq. after a Sunkist tune. BTR Stage 3 cam is next. Should make about 480 at the wheels.
Good luck with your build.
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