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I only skimmed through really quick to get the basic idea of what he's saying. It looks like a slight variant on what folks have been doing "forever" with water or Seafoam.
I wouldn't expect this to be effective. First, you have no control where the cleaner is actually going. Cylinders 1, 6 and anything with tight turns isn't going to get much cleaning. Second, a Valvetronic engine has nearly no vacuum or air flow until the engine loads increase. I'm not sure there would be enough velocity and turbulence to get things where they needed.
For the life of me I cannot find it, but someone did something I think would work well and I would consider if I had the much more deposit-prone N54. He drilled and added fittings and caps to his IM close to the head. In this case he used Amsoil Power Foam which is formulated to form and expanding, clingy foam that fills voids and works on the deposits. He just removed the caps/fittings, inserted the straw (which may have been something more like a 3 foot tube not just the little straw that came with the can), filled the area close to the valves, replaced the caps, wait 20 minutes, then drive. Easy to repeat frequently (as required by N54s).
Out of curiosity I watched a few N55 and N54 videos using this CRC cleaner. The idea of having the valves closed is so that this cleaner can sit and dwell on the valves and get the cleaning done well, and not get enough in the cylinder to hydrolock. Folks pump the used cleaner out of the valve chamber and wipe things up before moving on. Even at that I saw an N54 owner who still pulls all the plugs and runs on the starter for a bit to blow out all the cylinders.
TL;DR - It's really interesting to read alternative views, see what people are doing and discuss. I'm not sure I'd do it this way on an N55.
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