Does your clunk occur when you bounce down from the garage floor level down to the driveway level?
Here's something I found interesting. I too, have that loud "clunking" noise when I'm making left hand turns over bumps.
"This could be the infamous "front end clunk". Something else for you to learn about if you are new to Subarus.
In a nutshell, a clunking like noise can be produced in the front end under certain conditions. Usually, it occurs when turning across an irregularity ie: turning into a driveway etc where the wheel goes across the "little ditch" at the curb between the road and the driveway. Basically anything that makes the suspension work while turning. One doesn't have to be going fast, or even turning that sharp. Eg slow driving where right wheel goes over a slight bump at a storm sewer drain can produce it. Does this sound like what you are experiencing?
I don't think there has ever been a full resolution on this issue. Various attempts by Subaru have had various levels of success. One theory is power steering hoses (sometimes helps). Another is struts. (I had one changed, it helped, but I couldn't talk them into changing the other one.) To some degree, it is just a quirk of the car. Some have it worse than others (mine is slight - 97 OB). Overall, I haven't heard of anything failing or obviously wearing out faster as a result."