Eibach is one of the top lowering spring manufacturers in the industry. Here at Lethal Performance not only do we carry Eibach lowering springs but we've used them on several of our project cars over the years with great success. We even went 9.7@150mph in our 2015 Mustang GT with Eibach Pro-kit springs and a set of Viking Adjustable shocks as the only suspension mods on the car during that run. Eibach offers both a Pro-Kit and Sportline kits with the Sportline giving a deeper and more aggressive drop out of the two. Both sets of springs are direct replacements for the stock springs and fit perfect.