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There are tiny BB turbos, smaller than you would ever want to run on a DSM. The best dual BB turbos are the Garrett and Innovative lines. The Turbonetics ceramic BB isn't all that great. The times that dual BB makes the biggest difference is between shifts. It isn't a huge difference on initial spoolup, but between shifts the turbo keeps spinning fast and comes back online quicker. A lot of the quick spool up these newer gen turbos comes from other things too besides just the dual BB. Even a non-BB GT center section will help spool up compared to the old center sections. The big difference though is the GT exhaust wheels. They are much smaller than what was needed before with the old T3 turbine wheel, but they still flow a lot of exhaust. Since, you can run a smaller GT turbine wheel to get the power you want, it spools faster due to the much smaller sized exhaust wheel. For example the GT30 exhaust wheel that is used on turbos like the big FP3065 is actually smaller in size than a T3 Stage 3 wheel.
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