I just bought an Epiphone LEs paul Specail 2.. and I decided to complelty modify it. So, it comes down to this... is it possible to install a tremolo or a whammy bar on it? If so does anyone knoww how much would it cost? and would it be worth replacing the archtop?
Isn't the Les Paul special 2 a flat-top? You seem to have confused some terms.

It is possible to put a tremolo on it, but it's expensive. You can do it yourself, but it's difficult, requires the right tools, and you still have to buy a pretty expensive tremolo. A good one goes for around 150-200 dollars, or even more.