Have to agree with Dave, he has recouped a far amount back so in essence it is more economical than the supercharger kit and more reliable with regards out of the box running. To get Ross's figures I guess the charger costs would be in addition to the other mods done to ensure it had that level of power, not forgetting to mention breathing and gearbox uprating etc.
Like for like there is probably not much in it costwise but I know where I would put my money and that is purely down to the engineering involved, design, shelf life, complete package and has nothing to do with history apart from the known issues and R&D taken to get where it is. The VAG conversion has more scope and capacity for development whereas the KV6 charged route is probably at it's limit due to the engines internals, but that is best guess.
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