The IFV-6 is basically a Slammer with the turret removed. The removed weight of the turret is then re-added as armor on all sides, including the bottom of the hull. If anything, the IFV-6 should be able to at -least- sustain as many hits as the Slammer, and on average be able to take more than its MBT counterpart.
tl;dr: IFV-6 needs Slammer frontal arc armor both on front and sides, Slammer side armor on the back and top.
Cheers
Insta