Installed on my 2006 Lincoln LS V8 3.9L. All dyno lovers will be delighted when they put this on their cars. The engine sound alone is phenomenal. At the store, people are always asking me what's under my hood and exclaiming that the car sounds disgusting. I try to stay humble, but my manhood has never felt better. Not only did I go from 17.5mpg to 18.5mpg, I'm doing even more and still making those numbers! An absolute upgrade for your Lincoln LS V8, Ford Thunderbird V8 or Jaguar X-Type V8.