It's a oil filler cap... on the MV you'll loose the dipstick feature that the OEM cap has on it but, it does look better. CNC racing is my favorite accessory company! The selection and quality has been on par with bigger brands the color selection and options are just staggering. Odds are if you're looking for a billet peice to fit your bike... CNC Racing has a solution and options! More than any other company in my experience.