I think that in WRC it was only angled backwards. Anyway with the transverse I4 engines it's a lot better because the engines are way shorter in X vehicle axis (in X dimension it's two cylinders with very large bore for boxer instead of just one with small bore for I4) and are placed partially upon the front axle while the boxer is long and sits all in front of the axle. The center of gravity of the transversal I4 is a lot closer to the front axle than of the boxer. With regards to the overall inertia of the vehicle it's good to remind that it grows with the square of distance from the rotation point therefore the distance is more important than the weight itself.