Not unless I make a whole new pump from scratch. It's a turbine style cast iron impeller with fairly advanced design, using airfoil shaped "french curve" blades. It's in a thin-wall aluminum housing. And because it's gear driven, it's difficult to overdrive it. It's integrated into the cam gear cover, so leaving it in would make life simplier. So if I just "help" it, it should improve it's high speed performance. It's design was for 3250 RPM, so running it at 4500 might be cavitating it.