Well, pretty much from what i have concluded, Ball bearing turbos spool up to 15% faster than journal bearings. But Journal bearings are a little under half the price of a ball bearing turbo. You can get the same size turbo, Same trim, and both will produce the same amount of power in the end. How much of a difference can a ball bearing do compared to the journal bearing in drag races such as 1/8 and 1/4 mile? And is it worth getting the journal bearing, or save up for the ball bearing?