Review on Auto Meter 8504 Factory Mechanical by Mark Jefferson

Good caliber but for a more productive diesel I would recommend 0-60 caliber. I can't complain knowing that the stock turbo on the 5.9 liter Cummins can reach over 35psi. However, for my application this is probably better. It's easier to see the more common range of boost which I prefer for fuel economy (<5psi). Plenty of hoses are supplied and fittings can be a little tricky to find. Just be careful not to pull them out without making sure they're set up properly. If you don't have an intake horn with precut bushings, be sure to purchase a boost screw.