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I ran the Flowmaster 50 series 5" X 10" 3 chamber mufflers for about 2 years. They were quite loud even at moderate throttle, but were particularly irksome and resonant at a steady 70 mph. I ditched them in favor of generic turbo-style mufflers, at about $30 each. I noticed no power loss at all; in fact, performace seems to be a bit better, but I really appreciate the peace and quiet, not to mention these mufflers are less than half the size of the Flowmasters.
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