twin exhaust means 2 exhaust manifolds on the engine. V type
engines definitely need at least 2 exhaust manifolds. But
technically, it is possible for boxer engines like the one in the
rex to have 2 exhaust manifolds, but that will mean more weight and
more parts to put into the engine so i dun see the point if it's
gonna be used for racing so it's kinda weird for it to have twin
exhausts...
