I know this is old but it's time for an update.Check out Marty Fletchers work with the Magnum engines here http://utawesomeperformance.com/tech-info.html Some good products and dyno results to boot. I will be doing VRP mod with a catch can to my 5.2 Dakota. There is a 5.2/5.9 Magnum group on Facebook also...much info...Marty is there also.