I have Roush springs & stock shocks on mine, and also about 125lbs of stereo equipment in the trunk. Mine only sags when I have people in the back seat. If you look at any of the G4 Taurus' they have less wheelgap in the rear than in the front bone stock, and the springs are softer in the G4 than in other generations, so the extra weight over the rear axle is going to immediately cause a saggy butt look.