A significant change is apparent to the ear when the 800cc four is running. Ducati has abandoned the ‘Twin Pulse’ or ‘big bang’ firing order and gone back to their original and conventional 360 degree V4 with symmetrical firing order...’screamer’ style. This allows the exhaust waves from the front and back twin banks to share a two-into-one exhaust system with the two rear cylinders also working together through a second two-into-one system. Originally the Desmosedici 990 was made in two versions: the Twin Pulse version firing as a double big bang and the more powerful and smoother running screamer-type motor with evenly-spaced firing. The screamer made more power but the power delivery was too fierce, causing Ducati to turn back to the softer Twin Pulse.