I just got my 1/2" return fuel line installed, so I was able to pull out my dead head style regulator at the pump. I had it installed because my stock fuel line (as a return) wouldn't let the pressure at my carb get below 13 psi. So the pump is now totally freeflowing and it got a lot louder. I thought it would've got quieter, but guess I was wrong. I have 6" of rubber line on each side of the pump and rubber isolaters between the pump and frame(they are for mounting an oil tank to the frame of a Harley). Any other suggestions? It really buzzes good.