I originally thought the vast differences in what people have reported were due to differences in personal preference. Now it's starting to sound like quality control issues or inconsistency in manufacturing. HP gain is good, but resonance can get old very fast... especially on long trips. Been there, done that. I also wonder if installation (i.e. exact location and length of the muffler in relation to the rest of the system) could be the blame for the inconsistent results. Any engineer/physicist types here? It's been too long since my college physics courses for me to recall the specifics.
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