THis one will set you back a bit over $50K.

These boys have S&S motors, 4" bore by 4.5" stroke, 117 ci, about 2 litres.  They are guaranteed to dyno 107 HP at the rear wheel and carry a 4 year warranty

Big fat tire.  Yeah Baby!

This one was available used for $14K.  Pocket change!

THis beast had a 2,000 CC engine and made somethign like 140 HP at the rear wheel.  Scary.