I haven't had any experience with their sway bars but if they use the harder polyurethane bushing you'll likely hear more noise. My experience with poly bushings on a C3 vette restore I did drove me bananas.
Supposedly if you dope em up with enough grease it can provide some relief from the noise.
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2015 F06 M6 Silverstone Metallic II, Individual Full Leather, B&O, Night Vis, CCB, RKAutowerks (CP Rods/Pistons, DI Cams, CF Intakes, Coated DP's & Billet Diff Brace), InfinityAuto Turbo Inlets, Mishi Oil Cooler, JB4, XHP S3, BM S3
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