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I did the CBU cleaning recently myself and what a pain in the ass. I did send the intake plenum for Hot Tank, but I still had to scrape and scrape and scrape carbon off. Also, the swirl flaps are oftentimes hard caked with carbon and you will need to use a tool to carefully scrape the crap off. Additionally, blasting the ports was very nerve wracking for me (and I'm an experienced mechanic). I was extremely careful to ensure that the valve that I was blasting was closed (use a good borescope to verify). I saw posted on here recently that a car was taken to AARodriguez's shop because some num-nut got walnut shells in the cylinder and bent 2 rods! There's a reason to be careful right there. Also, make sure to empty your vacuum after blasting each port. I don't ever want to do this process again, but I know I'll have to in 50k miles...bad design by BMW, shame on them...
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