I've been eyeing various aftermarket exhausts.. I haven't found a single one that is $500. I've seen some as low as $71, a high of $467, but most are in the $180-$300 range. Loudness measured as db (decibels) range from as quiet as stock to straight pipe race exhausts that will make your ears bleed (not really).
Performance ratings are all over the board, some claim as much as 10hp difference over stock. Most of the real world reviews are the same as Weljo's... barely noticeable. I'm pretty sure most of the so called performance gain is from the weight reduction and not really the design of the silencer.
The main difference you get for your money is getting rid of the sewing machine weak stock sound. If you are satisfied with how your V sounds, then no real need to bother.
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May the road always curve in front of you.