I don't have a boot spoiler or anything extra on the tailgate but they are very solid. If I had a spoiler, it wouldn't bother me at all. Very easy to install. Using a small flathead screwdriver, gently pry up the retaining clip on the ends of the shock absorbers to seat the ball joint and loosen. Comes with new pivot points, just screw them down 10mm. Easy. You want this for your 350Z.