I have not, seeing as it just started this morning
I'll have to look to do that, but my roommate did mention that when she replaced my stopgap connector with the proper S hose (Because my hands are too big to fit in there without removing the entire bumper lol) there were a number of zap straps and she thinks that's probably what it is since it stops after it shakes itself into a spot. It doesn't change under throttle or anything, and seems to consistently go away after a little bit and is for absolutely certain coming from the hot side of the intercooler based on my laying there and listening to it. The alternative was that my AC compressor grenaded itself and has a giant hole in it, explaining why I don't have AC, and there's a bunch of rocks and metal bits in it that could be rattling. But that's been that way for months and it's not the right location sound wise for that either. I'm pulling the bumper off to install my Koyorad so I suppose that'll be the most obvious time this shows itself.
Otherwise, I suppose I'm fucked