adjusting your vtec wont gain you any power in stock form if not tuned or running aftermarket cams or turbo it will acctually hurt your motor early engagement wont be supplied with the amount of fuel it needs. so if your just wanting one b/c they cost 55$ and you want to mess with your engagement you would be better of not to get it. eventhough im sure its a nice vtec controller. my friend had one and thats why he bought it and it was nice for the price but he got rid of it b/c he was just want to mess with the engagement on his b16 with only h/i/e. which wont do anything.