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There are 5 levels of sound loudness made by Flowmaster. You can get the 30, 40 or 50 series. Then the 40 and 50 series are available with the "Delta-Flow" 3 chamber design. I have the 50 series with the Delta-Flow - the quietest. Sounds to me that's what you are looking for.

70 coupe, 302, 2v, 2 1/2" exhaust, with standard exhaust manifold, dual exhaust with the crossover pipe.
 
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