Competition big brother wheel size

[dzlpwr]

Ive got an S4T sitting on the shelf and Im thinking about using it in my twin setup with an SPS66. I was told that its the same charger as a B/B. Wheels measure 3. 5" in (91mm) and 3. 8" ex. It also has a 1. 15 A/R housing on it. Does anyone know how the B/B compares to this one? Any input appreciated.

 

[Timebomb]

Id Say Its Close, But That 1. 15a. r. Is Small For A Bottom Charger With That Size Compressor Wheel.