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The borla system and the eBay systems you see are pretty similar in design. There is no balance pipe between the two mufflers so drone is introduced. The fabspeeds has a pipe that connects the 2 mufflers and negates the drone.
I don't think the sound will differ between an S and non S.
If you are in LI/ Nassau county area I would be happy to catch up on a weekend morning and you can hear the borla for yourself.
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