hypothetical turbo swap
 

ok, basically what i'm looking for is what the difference between the stock S4 TII Turbo and a T7 (not exactly sure what that is, also would like to know) if i just swapped them out, i know a lot of people are saying "You gotta change this and this and that to do what you're talking about".... i'm not interested in knowing all that ;) that's why it's hypothetical, just want to know IF you didn't have to change anything at all what kind of difference would it be?

If their talking about swapping out the turbos themselves, T*** refers to the family of turbo among other things.

T04, T66, T76, etc

Is that what your asking?

You do have to change lots of things when you go from the stock turbo to an aftermartket one.

yeah, i guess i was wondering what you can tell from just "T7" like perhaps exhaust/intake port size or anything, maybe like compressor wheel size or whatever

http://fc3spro.com/TECH/MODS/TURBO/fullturbo.htm

That page answers all your questions to a T. It explains all the familys of turbos, how streetable / race applications differ between turbos. etc. It's a great read.