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Also, fwiw my friend just bought a ZL1 1LE with headers and no primary cats, stock cat-back and it's loud af. My stock SS runs about 85 dB when measured at autox events, his car would be at least 20 dB louder which equated to FOUR times louder subjectively and would fail to pass sound limits at any venue that limits them.
I'd just get a new muffler.
My thoughts are a substantial increase in power is going to require heads, cam and increased static compression ratio... or a supercharger.
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