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Originally Posted by SiGNAL748
pistons
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exactly that would be best to do hi comp pistons but if he doesnt want to tear apart the engine then there are more bolt ons like cam gears. pulleys, upgrade cpu, uprgrade fuel system and gut the interior. Im sure there is more but the best way to go NA is raise the compression, im not sure of what kind of ratios to use but ive heard of racers using 13 or 14:1 ratios and im sure higher but dont take my word im not sure what would be safe.