[five pt oh]

does anyone make an adjustable govenor that can be added to any car?

With my 2005 GT, I have a flash tuner. It is able to make all sorts of adjustments to the factory OBC. The idea is to make the car faster, but you can use it to reduce top speed (all the way down to 60mph) or you could use it to limit the RPMs (not let it go over 3000 rpms).

Obviously a 2005 Ford is going to have all sorts of factory computers that nobody would include when building a cobra, but is there something you can put on a basic V8 that allows mph or rpm adjustments?

That sure would be a nice thing to have for those with 16yr olds around the house who may try to sneak it out.