[Power Hungry]

Brian,

First off, welcome to the Forum!!

1999 DT466 in that model are usually factory rated around 230HP (sometimes 250 HP) with the MD3060. This is a very solid drivetrain and takes power increases well.

With that in mind, the Orion running in Level 4 is always a good option to start at, especially if you do not have boost or EGT gauges. Even compared against the factory 250 HP rating, our Level 4 - 250 HP tuning has some very significant difference that lead to better lower and upper RPM performance as well as improved drivability.

Bumping up to Level 5 - 275 HP doesn't seem like much, but again, this has a much broader power curve which results in better hauling capacity and drivability.

In general, we strongly advise to install an EGT gauge (Pyrometer) and a boost gauge if you plan to run Levels 6 or 7. This is to make sure that the Exhaust Temps stay in check. Things like aftermarket or custom exhaust systems can help reduce EGTs, making Level 6 or 7 a feasible option in situations where heavy hauling (like a dump truck) is the primary duty of the vehicle.

The Allison 3060 is a solid trans and can take a good bit of torque input without issue. Even with the power increases the Orion provides, the torque levels are still well within the capabilities of the transmission.

I hope this is helpful. If you have any other questions, feel free to give PHP a shout and our support staff can help answer any question in more detail.

Take care!