I really really have no idea about how to properly size a turbo, what a/r means and what dictates me getting a smaller or larger a/r,what is a divided housing, when a turbo is rated for 750 horsepower is that the maximum horsepower it will see at its highest efficiency before you start blowing hot air, or is this the number that gives you a rough estimate to when your turbo will blow itself to smithereens. I am very inexperienced on picking a turbo and would like some help to better understand what all these numbers mean. I Pm'ed MDC about this but figured I'm not the only one who doesn't understand this everyone can benefit, if you see this after my PM MDC sorry for making you do double the work. And for any help i may get thank you.