Yes ofcourse u can increase karizma´s power from 17 ps to 21 ps wid little modification in cams adn exhaust. it wil cost u around 10k and also replace ur ordinary spark plug wid NGK iridium spark plug. and use power 1 engine oil from castrol. replace oil for every 3000kms. power 1 will be gud even upto 4500 kms but its better to change soon ..