240 2NR has the exact idea I have - right down to why the Koni's bounce (BTW: are they yellows?). SL's are notorious for destroying dampers and handling like a$$. The spring rates are in the FAQ section.
Dunkee - yup, same problem for s14's. Unless you are running expensive short stroke dampers, you will have the same problems. But to buy $750 w/ of dampers and put Sportlines would be a crime that only one person I know would dare commit.
As for all the shout outs for cheap springs, you have to consider what your purpose is. If you are getting springs so your car will look better and you don't care if it handles like a '77 Impala I guess about any brand will do.
If you are looking for performance, you have some tough decisions to make. There are a few major obsticles here 1) the 240 doesn't like to be lowered more than 1.5" (camber); 2) most shocks will not really allow more than 1.5" of lowering (travel); 3) especially for the s14, there is no middle of the road - you either have near stock, crap, or high quality. All this means that if you want performance and 2" lowering, you WILL spend at least $1000.
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