505 performance sells a kit for around 3k. I pieced mine together for less but with the $500 I paid for my jeep it still would have been worth the cost. worth every penny! it doesn't have gobs of torque off idle but at 1500rpms it comes alive and pulls harder then any 4.0 I have ever had. I don't do slow speed crawling so its not an issue for me. I really want to do one in an automatic. I know it would be amazing!