it will probably give you that little bit more power. Technically, the way the tip expands on the GReddy PE would also give you a little more power. You get less pressure loss when gasses exit a pipe into a diverging nozzle than when the gasses exit thru a tube straight to the atmoshpere. Once again, this would be minimal though. Also, gradual area changes are much better for less backpressure, like the PE expands from the H pipe to the mufflers over a long distance, rather than just changing diameters in one step right at the mufflers. Just some thoughts.