Sorry off topic: I seriously doubt that anyone anywhere has any doubt about the disabling of emission control devices being illegal.
On topic:
Had a RWD road vehicle years back with an "Aussie locker" in it. Same principle as Detroit lockers. Whether it was just a poor copy or not - I don't know. But no one ever (driver or passenger) failed to notice it's intrusions.

. On a wet day, roundabout - diabolical!
Have Ashcroft ATBs installed in front & back diffs of my MY2013 DCPU. They can never give the same total locking as detroits. But the assistance they give is very positive both onroad and off-road.
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