That is the funny thing about exhaust systems. You can build two engines the same and can have them sound different. Let alone the two modified engines and what they were build like and what's been done to it they will differ that much more.
Also how the exhaust is ran will make a lot of difference in sound.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73
1992 Camaro RS 305 TBI
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