I have the RKAutowerks diff brace which requires you to reuse your current bushing so depending on the age/wear it might not be a good option. If you can find a cost permissive barely used diff brace to salvage the bushing from then RK's diff brace is a great option.
www.rkautowerks.com
Checkout GermanAutoWerks on IG or FB. I do not have the GAW diff but since their diff bushing is a field replaceable unit I think it is the best way to go.
https://www.instagram.com/germanautowerks3/
https://www.facebook.com/germanautowerks3
1391 Industrial Dr, Lake in the Hills, IL 60156.
Germanautowerks3@gmail.com
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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