Turbo`s
 

I am wondering what my bottom turbo should be. My truck is a 99 and I have a fass 150, guages edge juice with att. 90 hores injectors hot rod vp44.For my top turbo I got a good deal on a HT3B new so what do you think?
I do a lot of towing. Hauling trackhoe, skidsteer, dump trailer, vac unit and a lot of other stuff.The vac unit weights the most at almost 20,000lbs
I need to get a set of head studs.

HT3B will be the bottom/primary turbo, unless you are mounting them in an unconventional way. The other turbo can be a wide variety of units. I'm running a HX35/40 hybrid with a 16cm turbine housing. I will be going down to a 14cm turbine this spring, and adding an external wastegate. This way, I hope, I will have a quick spooling, high flowing, low back pressure set up.

How do you make it a hybrid? Have you been on a dyno I am wondering what power numbers are

You take a HX40's compressor wheel, and compressor cover and put them on a HX35. Here is an example of a kit:

Stage 3 Power Compressor Upgrade w/60mm Wheel 95-02 Dodge Cummins

Machining is required though.

Never had my truck on the rollers, maybe this September though.

Any other suggestions?

you could use a hx35 as your secondary and the ht3b as the primary that is a good towing setup, an othe good setup would be a 57/65/14 as a secondary and a s472 as the primary, that would be a really good towing setup, you might have to get some larger injectors to really compliment both setups.

I ran my HX35 as my secondary at first, then did the hybrid after. Spooled pretty quick.

"PRETTY" quick!? that thing spools like lightening!

That was with 65HP injectors and an EJWA. I have 150's now.

Raw whats the mas psi you have seen with your set up I am liking your setup and am thinking of doing the hybrid. unless someone else has something better to do I would like to spool as quick as it can