Zack is correct, but let me add...
DO NOT heat the springs to make them lower!!!
If you want to lower them, the best way is to use a hand saw like a hack saw or something of that nature.
Also note that you CAN'T cut, heat, or modify the rear springs in any way. HINT: What I'm also saying here is that you really don't wanna go much lower on the stock ss springs up front unless you plan on swapping springs in the rear. Cut SS springs with stock 9c1 springs will give the car a pretty substantial rake that only a select few find appealing.