BROTHERS upgrade kit is GREAT! It increases output from your center dash outlet vent by up to 60%. 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 GM back in 1972 to fix the problem of poor center vent volume. Our kit is easy to install and works great.