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Tom Butler Racing - Supertruck Team The #41 Supertruck is a W925 Kenworth running a NTC 400 big cam cummins, with compound holset turbocharging running 85 psi of boost putting out around 1500 HP, It has a mid mounted 5 speed powershift allison transmission, and an eaton rear end, Its running 4 wheel drum brakes with 9 inch linings and drums, Tom Butler Racing
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