Prism Supply Bristol Breather - CV Tumbled Battery Boxes Provides optimum rebound performance for

Provides optimum rebound performance for any given rider weight

but it's not required if you choose to allow your ThunderMax to "learn" the correct settings your specific motorcycle wants after choosing the correct base map Hundreds of maps available for various models

and rectifiers

And why shouldn't it

Machined from 6061 aluminum and given a factory matched matte black powder coat

Prism Supply Bristol Breather - CV Tumbled Battery Boxes Provides optimum rebound performance forPrism Supply Bristol breather for Keihin CV (Polished) If youre trying to keep your bike slim and looking clean, the Bristol Breather is for you. No more big clunky air cleaners on your carbkeep it simple with this bird catcher for your CV carburetor. The Bristol is made of aluminum and features a stainless steel mesh screen that flows a ton of air. Proudly made in Charlotte, North Carolina.