Skip the holiday special models, get the 14 gallon Ridgid from HD, it is the quietest $100 shop vacuum I've ever heard. Get the WD1451 kit though, it comes with the car detailing kit and extra hose at the same price as the WD1450...
A 1/2" gun might be a little better at it, but it would start running at the end of a lug nut with my MG325. I sold the impact and just use a breaker bar now.
For your uses it will be perfect, but the last time I tried an impact with it it left me wanting a larger tank to run for more than one nut without a short break (10 seconds or so) for it to recharge.
My armstrong 3/8" drive flex head ratchet came with an 88 tooth gear and 60 tooth pawl, so I've decided to look for an 88 tooth rebuild kit rather than send it in for warranty.
I'll have to take a look at my armstrong 3/8 flex head that I got from epsteins, because it is funny/slipping as well. I was just going to warranty it, but now...