I'm wondering if I order the 20g compressor wheel and housing will I need to have it balanced or can you just or just put it on? I want to keep the quick spool of the stock turbo but want a little more flow.

 

You should have it balanced for sure if you want it to last. If you're going to break down the turbo and rebuild the whole thing why wouldn't you just balance it at that point? It's not a lot of $$ and takes an hour tops if that.