I have the autotech fitted by myself and you can feel the difference with the engine. I thought about the apr pump but it costs too much for what it is. My only concern regarding the apr pump is that it uses a stiffer spring than the oe item. I was concerned about the extra pressure placed on the cam lobe, but that has been discussed to death on other topics. I fitted mine into my 50,000 mile fuel pump and its working fine with no issues.