The problem is these comparisons are rarely the result of an exhaust that has been designed specifically for the application. If you design a dual with the crossover it will likely out perform the single across the entire band. The single is just an easy way to get the crossover in a close spot...
To add if you drive like I do the number of times I cared if the exhaust flowed better (only a high RPM benefit) is zero. The loss of low end torque because I did not put a crossover pipe is something I would use. The single exhaust this is free :)
I put their dual conversion on my 318 Coronet. It sound cool, other than that for what you and I seem to care about there is no real value. The 66 Valiant I’m working on is getting the HP single they make were they make the Y more like a collector vs just a junction.
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