I have always heard good things about the Pro Kit from eibach on the fourth gen f-bodies. Ive even experienced the difference myself on a 02 Z28. I have never had any experience with the Sportlines though. Everyone always tells me the 2 inch drop is to low and you scrape on everything and the springs are too soft and dont perform as well as the Pro-Kit. I have nothing to scrape on where i live and the roads are very smooth. I just want to know which will perform better on a 97 WS6?