Well, it wasn't in the Boxster, but I hit 170 MPH on the straight at Miller Motorsports Park (only 3,000' long) on my 2005 MV Agusta F4 1000S motorcycle. The world goes by very quickly at 170 MPH on a motorcycle, especially when you need to slow down for the next corner
! At least I didn't need to worry about getting a ticket
.