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I'm also curious to know what the latest update is, since I have a very similar setup and also experience some drone in the same rpm range and gears you do. The only difference with my setup is that my LTHs are SP and my SW Retro Chambered cat back exhaust is the ZL1/1LE version, which has quad tips. However, I don't think either of those differences would cause any more/less drone with our systems.
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