KO3 rebuild questions
 

I searched through the forum for a bit and didn't find a lot of relevant information.

I'm planning on rebuilding the turbos in my friend's b5 s4 for him and I was wondering what kits are recommended by the people who have used them. they're completely stock KO3's and I've seen kits containing different parts from about 40 dollars to 120 dollars. Never worked on an audi before.