I bought the RCD (River City Diesel) kit off Ebay for $250. Very happy with it. Installed it myself and it took me 12-14 hours. They call for 6-8 hours, but I took my time to keep area clean, no spills and to keep stuff organized. The biggest pain for me was getting the turbo out as I couldn't see the rear mounting bolt. That was my first time doing any kind of serious wrenching on a powerstroke. I'm sure I could do the next one in 6-8 hours. Another popular kit is the Sinister kit.