not hard at all, direct bolt on. just before you paint the Gt rear bumper, the center lower push pin attatchment part gets cut off. the V6 only uses 2 of the 3. its only like 4 10 MM bolts that secure the bumper, then 4 screws, 2 on each side. - Roger
Now you REALLY need some bigger diameter wheels on it. Bodykit looks good and mounted tight. But it makes those wheels look even smaller in the wheel wells. I'd get a set of wheels soon and go now smaller than an 18. 19s would be even better and fit the proportions of the car with a bodykit like that.