The routing of multiple turbochargers can be complicated and somewhat bulky, so if you have the need to construct your own radiator overflow tank know that PPE offers their Weld-On Billet Radiator Neck to make the job easier. Made from 6061-T6 Aluminum, this unit accepts a standard size radiator cap and features a 1/8-inch NPT to 1/4-inch Hose Vent fitting.
Use a Stant Lev-R-Vent
16lbs. cap for Duramax applications.