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The BHP change is more than likely to do with emissions and fuel
All Honda engine's that come from the JDM usually run a higher compression ratio than the UK spec cars, it is mostly to do with the fuel though, thats why they get more BHP than we do
Andy
You dont get as much as youd think from higher octance fuel.
IIRC the major contributing factors to the JDM model having more bhp are a different header and freer flowing exhaust.