reason is silvia, skylines, supra, blah blah have em is because they are rear wheel drive and aluminum wings provide downforce, trust me all those people in Japan or the JDM enthusiasts dont put wings on their car unless the serve a purpose, as for the wrx and evo they add rear spoiler to provide traction for the rear wheels, but some also have front lip kits that provie downforce for the frnt too
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