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They weren't popular here, due to the price and like you say heavily corked European model. Fitting a wider airbox tube and vortex ECU seems to be the way to go. In the UK Honda even started selling it with their 'power up kit' which was essentially uncorking themselves but think the damage was done as it's now been discontinued. For obvious reasons they're a lot more popular across the pond and I've seen some epic builds.
Honda CRF450L Shirley. If I can find/afford one.