So.... I have confirmed that the loud clunking in the rear is not my suspension being completely and totally worn out, but it's the exhaust hitting the sway bar.
There's about 1/4" to 1/2" between the two.
Here's the reason why (I'm guessing):
That is not the stock resonator, and it is in fact 3 inches shorter than the stock resonator. But it's been there for quite a while, and it doesn't leak.
So I'm gonna see if I can find one of these:
I'm thinking 3" or 4" long should line everything up, back where it's supposed to be and cure the clunk.
Other option is to just buy a new cat-back, but shipping is expensive.