The '05 Renntech/AMG CL65 my wife got me is of the '05-06 65 series, which arguably is the highest top speed Mercedes ever made. Then, it was computer limited to 186 mph and the computer also reduced horsepower and torque by 15%. The price - then and now - to eliminate Mercedes speed and power limiters is around $3500 and MOST who buy Mercedes top-end cars pay it. A few also buy what it takes to take Mercedes, BMW, Audi etc motors back UP to the power they were built to have via companies such as Eurotech, Renntech, Classen, etc. For the early 65 series, it allows top speeds in the 220 mph range.
In the era of Jimmy Carter's "The energy crisis is REAL!!! It is NOW!!!", it became illegal to have speedometers in cars that showed more than 85 mph and most cars were computer limited to under 100 mph. This was the final nail in the coffins of American manufacturers and when imports captured and since have held the American market. So American manufacturers instead focused on pickup trucks and big SUVs, which are not high speed in general.
It was not until American manufacturers FINALLY started putting power back in their cars that they started to make a come-back. The horsepower wars of manufacturers are back on, getting VERY serious, and one result is sales are going up.
It is just bizarre that it was considered safe to drive a 1950s car 70 mph - when they had horrible brakes, dangerous tires, terrible suspensions and basically no safety in their design - and the same speed limit on open highways should apply to modern cars with ABS disc brakes, vast amounts of safety in design, air bags, computer designed and managed suspension and on and on. Driving across the Western desert limited to 70 mph is absurd. In all non-urban areas the speed limit should be raised to at least 85.