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I've long wondered if those vibratory cutters common in catalytic converter thefts would work on car clamps.

Having a set of keys is likely easier still. (or a pen cap, if those tube locks are as cheap as I imagine)

you mean a reciprocating saw?

I assume they mean something like this https://www.amazon.com/dp/B01E73VU36

I don't think that would cut through exhaust pipe very fast

Certainly not as quickly as a traditional saw, but I think noise level is the more important factor. They do have extensions for cutting through metal (steel) like this: https://www.amazon.com/Bosch-Starlock-Oscillating-Multi-Tool...

Have you ever used an oscillating multi tool? I can't turn mine on without hearing protection.