The HD6774 is based on the S467 (178855) and is a fantastic mid frame turbo that takes a bulletproof design and adds extra compressor flow along with some durability enhancements like a 360 degree thrust bearing in the same packaging!
The HD6774 turbocharger features the larger full size S400 comp cover and billet 67mm/91mm compressor wheel and the smaller 83mm/74mm turbine wheel. This is a geat setup when you still need 90+ lb/min with good spool. You can expect anywhere from 400whp to 850whp from this turbo in a single turbo application depending on engine size and boost pressure.
The oil inlet is 1/4 NPT. The optional downpipe flange/clamp are set up for a 4" downpipe. It has a conventional T4 S400 Spec outlet flange.