I have the same rattle on my engine, only when it's warm. The rattle goes if i rev and hold the engine at around 2k RPM then it comes back if it goes higher and then goes again as revs rise.
The rattle doesn't change pitch with engine speed though. The exhaust manifold doesn't have a heat sheild on it, and there is no under tray ether.
Any ideas? What is this exhaust bracket issue?
Thanks in advance folks,