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Since you want higher boost it really depends how far you are going to go. But for sure you want to change your pistons and connecting rods. If you are going pretty high boost, you could always get your cylinders sleaved, but it isn't as bad on the iron block... if you want, while the whole thing is open get it ported and polished for higher flow, which is even more important when going forced induction. If you want really high boost you will have to get a stronger crank, but I don't even knw if they make one for the ka. Other than that, slightly opeversized and reinforced valves (stainless steel usually) and some stronger valve springs so you can push the engine harder without worrying... there is a lot of stuff you can do that you don't have to though.
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