I had a rattle at lower RPMs on my V8 for a while right around 2000 RPM, and it was the bottom lip of the rear diffuser vibrating against the rolled lip of the muffler. Loosening the muffler clamps a bit and shifting it slightly to increase the clearance helped. I ultimately also stiffened the lower lip of the rear diffuser near the center (I have a late model center exhaust) since the diffuser was awfully floppy. Stiffening just entailed a piece of metal rod placed in the lower lip of the diffuser and secured with a couple dabs of sealant. In my case it was easy to see that this was the culprit because of the wear mark the diffuser lip and muffler lip were making against each other.Go for the easy items 1st such a heat shielding or loose sheet metal parts. Like exhaust or cat parts.
VERY common for the tailpipes to crack on the earlier side exhaust. I don't know about the center exhaust type but certainly something to check. The good news is they can be welded.The OE V8 side-tip exhausts were prone to breaking (and would rattle when that happened).
So, yeah, :tadts:
Yeah, same here. Had to re-weld a bracket on my centre exhaust tips. The rattling drove me nuts! There's still a heat shield somewhere that resonates at around 1000 rpm, but the exhaust noise helps to mask it.Meh.. mine does that too.. I suspect it's some heat shielding or exhaust pieces.. It only does that at idle ~950RPM and it's not at idle very often..
so I chalk it up to :tadts: