A Body Sway Bars

well i have an issue with running a rear sway bar . no one at tti can tell me if there 2 1/2 exhaust with tail pipes will fit with the firm feel rear sway bar . i'm doing a driver/street racer sleeper . a more door 70 dart with frame connectors n torque boxes , dana 60 , gv 727 , 500 hp 440 , k/h disc . its just street never getting slick'd up for the track . but its going to handle big t bars hd rear springs front n rear sway bars . i'm just trying to buy what fits , tti is a great system and in calif . has any body done this tti and firm feel together ?