i want to up grade my turbos to ball bearingturbos...i drive a b5 s4 which ball bearing turbo would be the best...?
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They are not bolt ons and require alot of work and money to make them fit and run. But anything from a gt28r to gt28rs would make an extreme amount of power if installed.

just FYI, the ko4 turbos from a RS4 are bolt ons and since they are still really small, dbb isnt needed to have them spool extremely fast. Not to mention people make over 500awhp with them