Billet Rear Differential Insert Fit For BMW F2X | F3X Chassis. Our Billet Rear Differential Inserts are machined from solid 6061 billet aluminum and then anodized black for corrosion resistance. This kit makes for a much stronger and stiffer support for your rear differential by getting rid of unwanted drivetrain slop and flexing. This leads to giving you better feedback, sharper response, more predictability on throttle input, along with eliminating annoying clunking during hard shifts. Best of all smoother power transition from drivetrain to the pavement. Our differential rear oil pump is easy to install, no need for complicated tools, easy to use, direct replacement for your old or broken one. They are manufactured to OEM specification and are ideal replacement for the original cars. This differential rear oil pump is made of high quality material, which are not easy to damage, wear-resistant and corrosion-resistant, high reliability, stable performance, strong and sturdy, long service life., Manufacturer: KNZVUUY