DOES ADDING HORSE POWER DECREASE RELIABILITY.IT SEEMS IF YOU HAVE HIGH FLOW INJECTORS THAT ATOMATIZES FUEL GOOD AND THE AIR TO BURN IT, IT WOULD LAST AS LONG AS IF IT WERE STOCK AS LONG AS YOU DON'T OVER BOOST AND WATCH EGT

 

The cummins guy I talked to, who has worked with the cummins enignes a long time said that 400hp would not hurt the b5.9 if you kept it cool and did not over boost it. that sounds right because I have seen 370hp B5.9 in boats that are stock that HP.<br>Dm01