Good evening, Martin (and all). I haven't heard of that kit; I wonder if it alters the cam/crank phasing on the fly? I can't imagine any other "bolt on" method. Of course, manufacturers for years have been providing variable valve timing via a variety of mechanisms. However, none have developed (as far as I know) my idea from the '80s, when I was a junior hotrodder, that is, rather than bother with an intake valve, why not just inject the air/fuel mixture together? Obviously a variation on fuel injection, so not only would the Air/fuel ratio would be alterable, but also the absolute mass of fuel/air injected. Theory would dictate major flow rates and gas velocities, and an exhaust valve would probably still be the easiest way to get it all out. If I wasn't so busy raising children and saving for MSEs I could develop the technology and call it the ProfPower omni-injection engine! Any engineers out there with nothing to do?