I drive the 1.4 RTE 16v 2000 model. I was considering changing the cam for a bigger, renault original part, maybe the 1.6 16v or the 1.8 16v cam. will this work and will there be a change in the hp of the car? what is the duration on the other cams? is it advisable to do this or should I get a cam made up for the car? safe duration size?