The e8248 hphv fuel pump is the loudest pump I've installed, by far. Too bad it's in my DD. She did shave .5s off my 0-50 though.. down from 7.9s to 7.4s. still not as fast as my wife's zj when manually shifting @ 6.7s. presently, my xj is only 4-500# over stock (mostly bumpers, tools are at shop).. wonder if that difference is all in the transmission... Got a while yet before I drop the m90 on it.. I know she was losing fuel pressure zip wouldn't even spin tires brake torqueing.. now it overpowers all the brakes in drive. I wonder if I wrap the pump in dynamat if it will quiet it down some...