Reddit mentions of Stanley Hardware S755-550 992 Triangle Corner Brace in Zinc, 2", 2 piece

It says that the hooks have a 100lb capacity each. The truth is that they can probably hold more, but I would consider the following:

1. You're cutting it close at 180 lbs
   
   
2. That rating is assuming a load in line with the hook axially, which you aren't doing. You're creating a moment, which changes the situation.
   
   
3. The 200 lbs rating would be for a static, even load. If you dropped the bar, causing an impulse, or racked it so that the weight was temporarily all on one hook, you could have a problem.
   
   Considering all of that- don't do it. If it were me, and you were dead set on using the studs in your wall for this purpose, I'd find something like a corner brace which has a triangular shape:
   
   http://www.amazon.com/Stanley-Hardware-2-Inch-Corner-Plated/dp/B00004Z0V0/ref=sr_1_6?ie=UTF8&qid=1421627249&sr=8-6&keywords=corner+brace
   
   But with a hook or knob at the end and more heavy duty than that one. Put some heavy duty screws in each one to hold it to the wall and I think that would serve you better.
   
   
   If you're really set on using hooks or something similar, I'd at least double up and probably find something even more heavy duty as well. In fact, use that advice for whatever solution you come up with. Be safe, then double it. I used to do pullups from a floor joist using 4 smaller hooks to hold the bar, weighing about 200 lbs. That did hold just fine, but again, that was using the hooks in line with the load.