Aiyooo... internal part sumore Japan standard also thinking want to high rev open rev cut.. safety bro... unless you have change all engine bearing then if you want to push each gear 9k rpm go for it.. my experience over rev blow my engine, 170kmh 4th gear, conrod snap, punch and make hole through the block, pieces of engine block fly 'through' radiator, Almost near death experience LOL... Wise people learn from another people mistake, unless you like to be white mice the experiment thing.. Good Luck