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I have the Borla version of the GMPP exhaust in a catback. There isn't any drone with it. It sounds like something came loose and is touching. There shouldn't be a rattling, the seat might vibrate little more, nothing to excessive, like a seat messager on low. Did you think this combo up? The Magnaflow Resonated Xpipe "Reduces" Drone, it doesn't cause it. I'll tell ya, you can get the catback pipes for the GMPP to add to your system for $400 on Amazon.com.
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