These taller cages have more surface area, more surface area equals more flow. If you have a hopped up motor and want to make sure it's getting all the air it needs a taller cage is going to help. The standard cage height on the mini breadbox and breadbox air cleaners is 1.1", this taller version is 1.7".
-1.7" inner and outer stainless steel cages
-1.7" Uni Filter foam filter element
-(2) 2" flat head #10-32 screws
This is only the thick cages and filter, cover and backing plate are not included.