~Solid mount your differential and get all of your power to the tires. ~CNC 6061 aluminum solid differential bushings with gold anodizing. Some gallery photos feature the solid subframe bushings which are sold separately and a great idea to do at the same time as the diff bushings & subframe reinforcement as well. For 1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi ~Solid diff bushings will increase rotational drivetrain noise, but will eliminate clunking and noise from worn rubber bushings. These bushings are a slip fit installation and may require epoxy due to variation in the stamped subframe holes.