i was wondering if you bought a car(or have one) that is say engineered for a 308(i know its not a toyota bear with me), would i need to get it re-engineered if i put a 1uz in it or would the certifcate cover the 1uz coz its smaller in capacity ie. 5 litres to 4 litres.BUT it does have more power output than the stock 308. does this pose a problem.