It looks like you are doing similar to what I am looking to do. I still plan on using the non VGT 62 and 75, but adding a 91 on the end. What sizes are you looking to use? Also interested in how it spools with piping that big, with the current issues with the steeds. I have the MPD log style, with 2 inch up pipes, going into a .90 housing, and it spools pretty damn quick. I am still planning to leave the two in the valley though. If I was going any bigger on the middle one, Id have to move it, or get a cowl hood... I'll def be following this, as I set up to purchase turbo and piping and bigger injectors to fuel the additional fan...