R-Spec (not headed for Australia) The new Genesis R-Spec is powered by the same, 228kW, 3.8-litre V6 that’s in the normal Genesis Coupe, but the power is sent to the rear wheels via a proper Torsen-clutch limited-slip differential. The car also sees the addition of new 19 inch wheels, 13.4 inch Brembo brakes and stiffened suspension with adjustable camber settings.