Thinking of Turbo Charging my 6 and have a few questions...

Yes,.I did see that thread, but didn't read through it yet. Thanks for reminding me. Since this Volvo Turbo is small, I'm figuring it will be perfect for my slanty and spool fast. I'm not drag racing it and it will be a DD. I'm also pretty sure that I don't need to run an intercooler being the boost will be around 8 to 9 lbs give or take. Would anyone know what the HP gain will be or is there a calculator to figure this out? What do you guys think? I'm thinking maybe a 50hp gain??