You can put 2 x 044's in the tank if you want too but space is normally the issue, we are weighing up this option with mine at the moment and leaning towards twin Aeromotives because they are smaller and quiet, newer etc.....
My single 044 ran out of flow at around 360rwkw (480rwhp) on E85 and didnt leave much buffer room incase a filter gets semi blocked etc (which i have recently experienced).
I am not much of a guru with this sort of thing, just going through it at the moment with my car and learning as i go