Home Products combine parts john deere engine horsepower modules 9550 9550 2 Available Products SALE P1550 - Horsepower Module For 7.6L, 8.1L engine with Bosch electronic fuel pump. ... SALE P5140 - Horsepower Module For 4.5L, 6.8L, 8.1L, 9.0L engine w/Nippondenso common rail. ... 2 Available Products