Alright. I am going to make a hotside for my combo, now that I have a mocked up engine to work with. That will require that I have a turbo to work up to. Compressor maps are waaay too much like college level trig for me,...( and I hate math) so, I am at a loss. You'd think that with all the science out there that there would be a turbo size calculator where you could just plug that junk in, and it would spit out the recommended A/R, hot side/cold side wheel size and frame size.....but no. I found this one was recommended by several http://www.squirrelpf.com/turbocalc/, and I used it to confuse myself further. I plugged in my specifics, and it did recommend a bazillion different makes along w/ their respective maps. I read, and read some more ( I may need to do even more of that) I do know that I'm gonna buy a Chinese turbo from the plethora of ebay suppliers out there I found this: http://www.godspeednet.com/media/10/a20791712487ec77bb2b2d_m.jpg From what I'm seeing I want a big A/R (towards 1.0) To tell the truth IDK what I want. But if this is a good one, It will be what I buy. I'm also gonna use an A2W intercooler,..and will use a separate little radiator w/ a pump circulating the water. I don't need the I/C yet, so it isn't as important as the primary.