Maybe I need to clarify.
The engine combination I outlined above at 466 to 472" works with OEM SD ECU programming. An adjustable FPR to mitigate the lean condition at WOT and heavy acceleration out of closed loop is helpful along with 26# injectors if you are at or near sea level. Some additional initial timing gets the total timing closer to ideal. The fuel trim window will take care of closed loop operation.
Is there room for improvement? Yes.
Is it absolutely necessary? No.
The OEM 33 gph fuel pump(s) and 24# injectors are at their limit at 365 ish hp which is about what the build makes as installed.
Quantum fuel systems makes drop in 255 lph fuel pump modules.
In certain heavyweight Class A and C MH applications the OEM 460 does not make enough throttled torque
to move the vehicle in closed loop so WOT or near WOT operation is in the high 13's to low 14's AF which over time hurts exhaust valves and seats. Not to mention cooking the exhaust manifolds lol.
If you improve throttled torque the ecm will stay in closed loop longer with an increase in fuel economy. We have some clients reporting between 12 and 13.7 mpg in F250 4x and F350 applications.
If you want to push beyond the power the linked combination provides then a custom tune is going to be necessary.
We have several 545" EFI combinations that make near 500 hp and over 625 tq in a very similar operational window as the OEM engine does.
Custom tune definitely required.
With a bit of runner work at the exits the OEM intake is pretty good. Long runners and smallish cross section make for good torque both part throttle and at WOT.
Hope this helps clarify.
used 2b RHP