here is a question for those who like to modify engines. with a limited budget of P15K, what can be done to a stock 2E to gain 20hp. the engine block must be retained in its stock form. can i change the head, if so to what.12v or 16v. do i get it polished. What about the exhaust system. from stock to free flow, how big a diameter pipe will be used? Simota or K&N air filter? change or rejet the carb.