if the body goes up and the suspension goes down (aka full travel) then those pipes will smash into the sway bar. it will be even worse with a lowered car since you are trying to tuck it up to the body on a suspension setup that is sitting closer to the body.
i'm just seeing too much negative for it to be outweighed by any positive. i say you dump at the rear axle and run fake tips. no bends to rob power, good clearance, and tips!