[real saxophonist]

Of course there's reason to steal them. What a vehicle owner does in such a state after the convertor is stolen is the 'Hmm'.

They're at least going to have to do something about the vehicle being loud as hell.

[oldtech]

The loudness of the vehicle that is minus a converter would vary. Some might not even be noticeable if necessary piping is replaced.

[shotgun]

With all the computer sensors monitoring the vehicles emissions system, some new models may not be able to run. On my 2013 F350 Diesel, if the DEF sensors fail, the truck goes into limp-mode, and you better have at least $2,500 you can spend to get it fixed