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You can't determine anything about an exhaust system by looking at photos of some of its components. You can infer some obvious design qualities, but you can't claim to have any knowledge of how it flows when installed. Same thing with random uncontrolled dyno results.
You also can't determine anything of value from individual stories. Unless you have a standardized and somewhat reliable measure of some particular factor, let's say flowthrough, all you have is conjecture until you test as many random samples as you can on certified equipment and have that data in turn reviewed and analyzed by a blind third party. Then you can tell us what kind of flow one or the other tends to make, but nothing beyond that. You can't jump to conclusions, and you can't tell anything about a system's efficiency by any of its component parts. You certainly can't tell me how well something works by looking at it, just like you can't accurately measure your own 0-60 runs or tell me how much your car weighs by trying to lift it.
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