i heard so much about the cold spark plug and it is good for turbo system. but i can not find it in my country, so using the stock spark plug make waste on pwer ? and will it damage ?
there are kind of spark in my country called split-fire does anyone know it ?

without a long explanation. basically,

the colder plugs do not make more power. the colder plugs basically helps with detonation.

i use NGK BKR7E.

http://ngk.carshopinc.com/product_info.php/products_id/81167/BKR7E-11

Try to avoid platinum spark plugs. They tend to burn up pretty fast in turbo cars. Try to find a set of Irridium plugs. NGK and Denso are your best bets.

spark plugs are EVIL