plenum spacers

By adding spacers, you can loose bottom end with the wrong spacers. You should use the spacers that have the divided wall to help keep the effect a dual plane intake. i have tried different space that were open like a single plane on a single plane intake, and it did help some on top end, lost a little on the bottom end. Also tried spacers on dual plane intake, went to the divided spacer and gain some top end, but did not loose any bottom end. That was just my test results. Depends on the motor.