You can even damage the engine at low speed, about the speed bump, curb or something else. Vote in favor of protection. From personal experience. When I went to 'nine', was in following binding. In winter, the unpeeled roads, yards and out of town a few times 'Freeze' on defense. Wheels 'hang', if there is no one to pull off, complete priest, had to dig a sapper shovel.
In general, I unscrewed the defense. Not than a couple of months in the spring, called in once the patio, the rate of 15-20km / h. And accidentally bump the wheel on the edge of the hatch CLOSED. Horrible hit bottom, as if the car blew up! The engine immediately stalls. I went out to look, I open the hood and ofigevayu! The box was split like a walnut! It turns out a cast-iron rim, which put the hatch, was cleaved edge.

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