Tracks, private roads, autobahns, dynos, plenty of places to go fast legally. Not to mention the extra power goes towards faster acceleration, not just top speed. The same force that gets you an extra 10mph top speed also works to get you from from 0-60mph that much faster.
Especially Autobahn in Germany is interesting. Generally there is no speed limit, but something called "Richtgeschwindigkeit" (the advised speed you should go, which is 130km/h). But there ARE speed limits on most parts of the Autobahn (construction sites are generally limited to 60 or 80km/h, dangerous sections, etc. so it's often limited to 100-140 km/h). Sections without speed limit are a lot of fun and created a…
A general speed limit on the Autobahn is long overdue. Lots of our neighbours (see Austria, Switzerland, Netherlands, Italy) are doing fine that way.