Don't take the Chance of your X3 engine with the OEM plastic oil pump gears. They break easy and when they do it drops all oil pressure to the engine and resulting in a complete engine overhaul.
The idler gears are the weakest link of the system. At a minimum we recommend upgrading your idler gears. For extra security also upgrade the oil pump gears. These are designed and made to with stand the abuse your high HP X3 can put them through and made out of materials to have the best longevity.
Note: You will notice a slight gear wine with straight cut metal gears.