The power-advantage makes traffic light sprints and overtaking a real pleasure and safer.
The carburetion might need not be modified. The cheapest solution for more power. Most effective with big bore cylinders.
The modification is not visible from the outside.
Race Version for maximum power. Touring version available too. Control of the spacing between valves and piston is necessary. Lift the cylinder with gaskets, if necessary for good squish clearance and reliability.