Mine gets extremely loud at the end of a 80 mile trip. And it isn't the original pump, and it isn't eh second pump...
The second pump got changed out because it was running all the time, but the problem is so is this third pump.
Not sure what to do about it. One one hand the motor is certainly not starved for fuel, so I doubt it's the filter, but on the other hand I am having a tough time figuring out just where the fuel pressure regulator is (looks like a small one up on the fuel rail, but the FPR's for sale look like they go back by the pump?).