hairy bean bag

I am wanting to build my own Twin setup.Im looking at putting a s400 infront of my stock turbo.Would this be a good ideal?
I do tow quite regurlaly now that the weather is nice and already have 370 injectors, DV's and a 100 and #10 plate that i swap out to when i tow.
As of right now my egts are through the roof so I was wanting to get some opionions on a twin turbo set up for my truck.

hx 35 and s400 or what would be a good setup?im not looking for 70 lbs of boost just enuff to get the egts down and some more power to the ground.What would you fellows sugest as a good towing twins setup?