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just sitting there and reving it is not a real test of how it sound's i found that out the hard way with my fswerks system. way too loud and droning at 3k rpms as you wind it up. i really think some sort of resonator is needed for all these systems..
 

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Sounds pretty clean when you rev it hard. Best way to determine sound is under load going thru the gears with the camera behind the car. I'm going to do that in a couple hours with my catless downpipe to stock catback


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