The Aprilia RS 660 does not get an Akrapovic exhaust system as standard, however, you may have it installed from the dealership as an additional accessory.
The Aprilia RS 660 is powered by a Euro 5-compliant 659cc, parallel-twin engine. It makes 100PS at 10,500rpm and 67Nm at 8,500rpm, mated to a 6-speed transmission featuring a bi-directional quickshifter.