What was found
PILOT REPORTED THAT DURING TAKEOFF ROLL, THE RIGHT MANIFOLD INDICATION DECREASED TO STATION PRESSURE, AND ABORTED THE TAKEOFF WHILE STILL ON THE RUNWAY. NO ACTUAL LOSS OF POWER WAS REPORTED. UPON INSPECTION, IT WAS FOUND THAT STEEL MANIFOLD PRESSURE LINE FROM THE INDUCTION PIPE TO FIREWALL HAD BROKEN AT THE FLARE ON THE INDUCTION PIPE END. TUBE WAS CUT AND REFLARED. GROUND CHECK NORMAL.