I'm sorry. I'm not trying to be a smart a**, I just cant picture how this could be happening.
Your tailpipes are between the axle and the tank shield.
Maybe you could 'clock' the sway bar down and forward a little more so it wont hit anything? It took me a few minutes of moving my bar around before I got the side-to-side position and clocking on the axle right and then I tightened it down.