Speed-linked vs. bump-linked
A rattle tied to engine RPM (not road bumps) narrows the list to a handful of usual suspects.
A rattle that gets louder with engine speed usually traces to the exhaust, a heat shield, or engine mounts.
Louder the harder you accelerate
Sounds like it's under the car
Thin metal heat shields work loose over time and buzz against the exhaust pipe.
A failing mount lets the engine shift enough to rattle nearby parts under load.
Worth ruling out before paying for diagnosis.
A rattle tied to engine RPM (not road bumps) narrows the list to a handful of usual suspects.