The V-Quad engine, basically a side by side V-Twin, that Greg Nelson produces, was installed in a custom motorcycle built by Brouhard Design for owner Mike Maggio. They took it to Bonneville recently and Maggio ran 164.172 mph for a new record in the APGU class. This is an open motorcycle (no fairings or streamlining), push rod, gas, unlimited engine size above 3,000 cc's. This is the production V-Quad engine you can buy. That's a pretty fast run in the wind and on the salt.
Greg says they're already working on an upgrade with plans for 180 mph in October at El Mirage. Sounds to me like it has plenty of power for that cruise around town.
Link: Nelson Engineering
Related: V-Quad Bagger