Purchased a set of used 2011 WRX Struts to bolt onto my 2010 Forester XT to drop it a little. Got everything all bolted up, backing out the garage I hear a huge thud! Then another and another within maybe 20-30 feet on the dirt road that leads to the garage. Its coming from the rear so I stop the car to double check I tightened everything up, check. Step on the rear bumper and the rear struts sound like they are bottoming out, but they are fast to rebound. At first I thought I was the 3/8" sbs, but after giving the rear end a good couple of shoves its definitely not. Now to figure out on buying new struts, sourcing another set of used, or working to have these rebuilt. What else could the noise be if the struts aren't blown?