Originally Posted by ENT-Z

Well I did not do the install myself so this information is based on conversations I had with my installer along the way. I think the location of where the spring sits in the SPL mid link is higher than the stock mounting location. So he measured it out with adjustment in the middle on the SPL mid link and there was about 7" of space so we went with the 7" spring length. I ended up with a 0.5 inch drop overall from the Nismo spring that was on there before (which I believe is about 12" length). This was also the spring length recommended by SPL to keep stock height. So I can still lower the rear an additional 1.5 inches (total 2 inch drop) or raise it up 1 inch higher than it was before. Does that help?