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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
Rumbles like a noise or feeling is being produced?
Is this effecting performance or causing warning lights to come on?
Possible causes so far lead to a faulty engine or trans mount, faulty exhaust heat shield, broken baffle inside one of the converters. Aftermerket catalytic converters are designed almost identical as your.
Thanks for using Just Answer, and rating me so I am compensated, Chris
A sound like this points me into looking at cracked exhaust manifolds or leaking manifold gaskets from broken studs. Can you check those areas for signs of black carbon residue from a leak.
Hello again Chris here,