Supercharge6, As others have said, your engine has already done 130k. What do you think would happen to it if you just increased its power level without a total rebuild? I doubt it will last very long before it packs up.Unfortunately what you are after will never be a cheap option. A standard Mk1 Focus is not designed to run at double the standard power without a lot of other modifications to the brakes, suspension etc.
Sell it and buy a car that has the extra power built in as standard would be my advice.