From what I have read, the ball bearing is more forgiving with an unbalanced assembly. The owner of Pensacola Diesel said he has had twice the warranty claims with the 38R than the BD unit.
I like the stock turbo as well, but after going through 2 of them I figured I'd upgrade.
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01 F350 7.3 4x4 CC SRW/3.73/315-75-16/Aeroforce Interceptor/BD Thruster II/ Bellowed Up-Pipes/4" turbo back exhaust/CCV Mod/DIY 6637/FPR Shimmed to 65 PSI/TS chip reburned with PHP tunes (Stock, 40T WITH Whsiper tune, 80DD, 100R, 140Ex, 140SS)/Replaced and Cleaned EBPS & Tube 4-6-12/Zoodad mod/Recon smoked cab lights/MM Hubs/Cowl Hood/HPx
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