4 bolts, any socket set will get it off. mine comes with one as standard. if you dont have one already you may have to fit it. probably fitting across the strut tops but you will need to get underneath to fit the nuts underneath, which may mean removing suspension. or they might use the nuts on top of the suspension that you can see from the engine bay. which will make it easier.
someone had one on a mini (along with a roll cage) and something to do with being an idiot and crap at mechanics managed to roll his car going round a corner at normal speed.
all it does is stiffen the chassis roll (engineered roll which the body does to absorb bumps etc.) its not a bad thing that they roll. at the front and rear it keeps the chassis strut tops in line with each other (in a sideways motion) so they dont flex. the flex of the bar when too stiff adds the wrong type of force (a forward and back motion) which alters camber in the wrong way. my strut bar (honda factory fitted) is really easy to bend.
when on a track you want the car to be as stiff as possible. so strong bars are good!