I heard your S/C was just as fast. you run what a 12.8 with your buick now if I am correct? thats a little low for 518whp. Might wanna have daddy take a look at it.
They are easy to do, unless you manage to break the bolt that connects the strut tower to the assembly. That bolt is very easy to break on a SHO with a decent amount of miles. Otherwise it could be done in 2-4 hours max.