I see a few Cummins turbos for sale on marketplace near me and I'm tempted to get one. I see a few threads on them but am unsure of If i absolutely need an external wastegate or if the internal ones are okay. I still have stock injectors and fuel rail as well. Upgraded tranny to sr20 trans and a stronger driveshaft to an r200. Also will I need the 280zx drive axles?