Never ever cut/heat your springs. Reason why is that your spring is set at a certain rate for the length of the spring. When you cut the spring you effectively change the length of the spring but not the spring rate itself (amount of energy to compress a spring).
Think of your car like a wagon going down a steep hill, and a mountain bike with full suspension - who will have more control? Of course the mountain bike cause it has suspension to soak up the bumps and dips. Whereas the red wagon will be totally out of control as it has no suspension to soak up the bumps and dips.
This would happen to your car now with cut springs as you enter a corner. You will effectively loose control if the corner is bumpy and rough cause you will be bouncing off the shorter spring you created.
Most aftermarket springs are shorter in height but they make up for that by making the spring stiffer (more spring rate).
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