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Silly question alert - when would this come in handy? I assume if rallying etc its a good idea and also a bit of off-roading (would you do that in an Impreza?). anyway, for normal road use when, hopefully, there wont be rocks pelting the underside of your car are these actually worth buying?
Sorry if there's an obvious answer but I don't entirely get it.
Comes in handy when you look under the rear and see a nice prodrive diff gaurd looking back. Other than that I've no idea for a road car unless your on a rocky road, dont slow down for sleeping policemen or just run over a police man.