You're not going to do anything to the springs. If anything there might be some accelerated wear on the insides of your tires from lower ride height.
In my opinion, getting winter tires is a much better/safer option then touring around with 120lbs of sand. Those extra 120lbs of sand will only help the car continue rotating in the event of loss of control.
Also, when you run the sandbags, have the pushed as far forward as they will go in the trunk. If guess if you're going to do this you want them centralized over the subframe.
__________________ Nelson Papel
1997 Madeira Violet 328is - Carbonio Intake, Racing Dynamics exhaust, fan delete, ASC delete, M50 intake manifold, M3 Cams, Eurospeed/AA software, 3.38LSD, M3 f&r brakes + MC, Bilstein PSS, Eibach swaybars, BBS RK 17x8" wheels, Toyo T1R (235/40R17) tires, Racing Dynamics K55 kit, full euro lighting, 4300k HID lows, etc..........
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