Pro flow twister ???
Moroso makes the Moroso spiral flow, which is basically the same design, which can be purchased from either Jegs or Summit
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The Best V8 Stories One Small Block at Time
Mine sounds awesome, not only IMHO but it receives a lot of compliments as well.
The guy who said they sounded mediocre either has different taste, had other components in his exhaust that didn't work well with the Flo Pros (at least sound-wise) or it could be due to the the fact he had them on an LS1. I find that Iron block motors tend to "sound better", but it's a subjective thing... 






