BROTHERS upgrade kit is GREAT! It increases output from your center dash outlet vent by up to 60 percent. The original cross flow design effectively cancels out the air flow causing poor volume from the center vent. At the heart of BROTHERS kit is a new molded vent adapter and a remote outlet bypass. A similar modification was illustrated by the factory back in 1972 to fix the problem of poor center vent volume. Our kit is easy to install and works great.