I've been doing some research and I think it likely that I didn't do a good enough job sealing the baffle covers after I put the stainless pot scrubbers in them. I'll pull the valve cover tomorrow.
Bought a used engine (1.6L, long-nose), transmission (5spd), PPF, drive axle, VLSD, rear subframe, half-shafts, and suspension links for $400, engine runs well and all the bits are apparently in decent shape. Because race car.
I think it was a problem on the earlier Bose woofers. I think they changed the design at some point to correct the issue.Really? Hmm... Mine don't sound too aweful, but then again, I have a hard time hearing them over the exhaust. LOL.