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KB SC Boss 302-Stock vs. KB 168 throttle Body Obviously Ford never envisioned its 80mm throttle body supporting over 700 rwhp, so an upgrade was in order. Installation of the Kenne Bell 168mm throttle body resulted in a jump in boost from 15 psi to 16.6 psi, and a sizable jump in power. The throttle body swap increased the power output from 722 hp to 765 hp (over 40 hp). The gains from the high-flow throttle body are even more impressive at higher power and boost levels.