what kind of gains can be seen when swapping an evo 8 16g into an sti. How hard is this swap. any info on this swap is needed

 

Short version, you can't nor should you. Long version, you can but why would you want to? There are no kits to do this and it would be stupidly expensive to do.

There are much better turbo's for the sti that won't cost nearly as much.

 

What he said...

Also how much bigger is the 16G than the vf39?

And I'm guessing you're getting a really nice deal on the turbo right?

 

i know a wrx with a 16g but it wasnt from an evo.

 

Yeah by the time you spend the flow on parts and materials to make it happen you might as well bought a larger one and bolted it on. Unless you are looking for being unique. good luck