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I have cut the springs on several cars I've owned over the years, including a 122s, and I have also bought expensive Eibach sport springs for another car I had (a MB 190E). I have also heated the springs on a car, and would never recommend that method.
Heating them is so imprecise you don't get a really good idea of how low it's going to settle until it is much too late. Plus, it changes the metal-temper of the spring in the area you heated it, and it won't help the handling one bit, not to mention if you aren't careful you may find yourself looking for a fire extinguisher in a big hurry.
The best method (in my opinion) is to cut the spring with a die grinder or plasma cutter. The plasma cutter is a very localized heat at the very end of the spring, so it won't effect anything, and it cuts very quickly. The die grinder works just as well, but takes a little longer. If you have lots of patience, a hacksaw will do the job too.
For the record - I am a mechanic, and I have heard all the pro/cons of cutting springs, and from my experience cutting springs and riding in cares with them cut - I would put money on most enthusiests not being able to tell the difference between replacement sprot springs, and cut springs. I do not buy into the arguement that they alter spring rate in any negative way any moreso then replacment springs alter spring rate. By cutting an 1" off a 12" long spring, you are going to increase the spring rate by about 9% (there are a few varying factors) - that is very similar to what you can expect on a sport spring. It will improve the feel of the car, and you will like it. Trust me.
If I can help at all - feel free to email me - dma251@yahoo.com
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