I'm assuming if your downpipe is hitting that you have an aftermarkdet pipe or headers?

Free: take a look at the center of your sway bar, does the point aim up or down? If up, remove the endlinks, and center bushings, take the bar out, flip it over so that the point aims down and reinstall it. TIP: lowering the subframe 2-3 inches in the back will help you get the center bushing bolts much easier and get the bar in and out.