The power module tricks the cdi into thinking the bike is running at around 35kph. The timing is not as retarded at this speed so the cdi gives you the boost right off the line. I paid $100 can for it but it is also availiable from a larger distributer for $180 can.

The stock snorkle is fairly restrictive and the diamondg just increases the airflow to the airbox. More air in + less restrictive exhaust = more hp.