Quote:
Originally Posted by Lonewolf
^^^I think this is correct. The prokit is usually something like a 1.5 inch drop, and the Sportlines (aka "StrutKillers") are something like a 2 inch drop.
I've had two buddies blow their oem struts within weeks after installing the sportlines...I don't know why Eibach still offers them 
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I think what he meant is that the pro kit springs usually have a higher spring rate than the sportlines. The sportlines are usually much too low of a spring rate for the drop that they offer which results in a poor handling ride. They are all for looks and comfort, not performance.