from another forum:
A Big Brother is actually a S4T not a S400. So the 75 and 80mm wheels mentioned above dont pertain. The standard S4T is 88mm and flows 120lbs/min. The modified version is up in the 90mm range but I don't know exactly. Most of the S4T compressors don't flow all that well for their size. BTW for those that don't know....Ken Diaz from Turbo Auto Diesel coined the Big Brother name for the S4T well before II. I ran one in my '02 in 2003 and it was LAGGY.
hope this helps
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2011 Ford F-150 Lariat 4X4
RIP BFD99, jponder, and Forrest Nearing
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