first off NEVER heat coils cut them with a cut off wheel, the number off coils cut off is not a gauge to lower a car the only way to know for sure is to do the math and for that you must know the spring rate, coil wire dia. number of coils, installed height, and you need to know the lever ratio of the lower control arm as well as the wheel centerline all this affects the ride height THAT is why it is so hard to determine ride hight and why we get this type of questions.
The poor man's way is to cut off 1/2 the amount you want to lower the car, for most springs cutting off one coil will shorten the spring about 1"-1 1/2" so multiply that by 2 and you get 2"-3" lower but er on the short side because this is only a ROUGH guide
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