BORGESON steering box

Anyone having an issue with the Borgeson box making a hissing or whooshing sound when at center? Sound goes away when turning. My setup is a magnum 360 with stock truck serpantine belt setup and pump. Also with 3deg. Pos caster I still feel the effort is too easy. Thinking of ordering shim kit. Hit my Dougs headers as well, can't raise motor, no room for air cleaner with edelbrock air gap.
Nates68